do an-luat-26-01-hoan-thanh-v3

TI:NG DNG CONTROL CHARL

Bo co Thit k cng trnhSVTH : Hunh Ngc LutMC LCCHNG 1 :GII THIU KIN TRC11.1. Gii php kin trc11.1.1. Mt bng v phn khu chc nng11.1.2. Hnh khi21.1.3. H thng giao thng21.2. Cc loi cn h31.2.1. Cn h 90m231.2.2. Cn h 127 m241.3. La chn gii php kt cu ph hp vi kin trc41.4. H kt cu chu lc cng trnh:5CHNG 2 :D LIU THIT K S B62.1. Tiu chun thit k62.2. Chn vt liu62.2.1. B tng62.2.2. Ct thp62.3. S b tr ct v kch thc tit din72.3.1. Chn chiu dy sn72.3.2. Chn tit din dm7CHNG 3 :TNH TON SN TNG IN HNH113.2. Tnh ti123.2.1. Trng lng bn thn v cc lp hon thin123.2.2. Ti trng tng gch xy trn sn133.2.3. Tnh ti tc dng ln sn153.3. Hot ti163.4. S tnh:173.5. Tng ti trng tc dng ln bn183.5.1. i vi bn k 4 cnh183.5.2. i vi bn loi dm183.6. Tnh ct thp sn tng in hnh183.6.1. Tnh ton c th cho 1 trng hp: bn S4193.6.2. Tnh ton ct thp sn bn dm S6253.7. Bng tnh ton ct thp cho sn tng in hnh283.8. Kim tra vng sn333.8.1. vng bn k 4 cnh333.8.2. vng bn loi dm34CHNG 4 :TNH TON CU THANG IN HNH354.1. Tng quan v cu thang trong cng trnh:354.2. La chn kt cu354.3. Ti trng tc dng ln cu thang364.3.1. Ti trng trn bn thang (q1)384.3.2. Ti trng trn bn chiu ngh (q2)394.4. Tnh ton bn thang394.4.1. S tnh394.5. Tnh ton thp cu thang tng in hnh434.5.1. Tnh thp cho bn thang444.5.2. Tnh thp v tr gy khc45CHNG 5 :TNH TON CT THP KHUNG TRC 2465.1. Chn kch thc tit din465.1.1. Chn tit din ct465.1.2. Chn tit din dm v vch thang my505.2. Ti trng tc dng505.2.1. Ti trng ng505.2.2. Ti trng ngang575.3. T hp ti trng, ni lc, chuyn v595.4. Cu trc t hp595.5. Kim tra m hnh theo TCXD198-1997615.5.1. Kim tra tnh hp l ca m hnh615.6. Tnh ton v b tr thp dm khung trc 2625.6.2. Tnh ton dm c th B16645.6.3. Tnh thp ai cho dm khung trc 2675.6.4. Tnh ct treo ti v tr dm ph gc ln dm chnh695.6.5. Bng tnh thp dm B16, B37,B58 khung trc 2725.7. Tnh ton v b tr thp ct khung trc 2775.7.2. Vt liu785.7.3. L thuyt tnh ton795.7.4. Tnh ton ct c th ct C2 Tng trt825.7.5. Tnh ton v b tr ct thp ai ct865.7.6. Bng tnh ton ct thp ct khung trc 2885.8. Neo v ni chng ct thp935.8.1. Neo ct thp935.8.2. Ni chng ct thp935.9. Kim tra n nh tng th cng trnh945.9.1. Kim tra cng945.9.2. Kim tra chng lt95CHNG 6 :TNH TON MNG CC P KHUNG TRC 2966.1. Gii thiu cng trnh966.2. iu kin a cht cng trnh966.2.1. a tng966.2.2. nh gi iu kin a cht986.2.3. La chn gii php nn mng986.3. C s tnh ton.986.3.1. Cc gi thit tnh ton:986.3.2. Cc loi ti trng dng tnh ton996.4. Tnh ton Mng Cc khung trc 2996.4.1. Ti trng tnh ton mng996.4.2. Ti trng mng M21006.4.3. Ti trng mng M81006.5. S b chiu su y i v cc kch thc:1006.6. Vt liu v kch thc cc p1016.7. Sc chu ti cc1036.7.1. Theo vt liu lm cc1036.7.2. Sc chu ti cc theo ch tiu c l ca t nn ph lc A1036.7.3. Sc chu ti ca cc theo ch tiu cng ph lc B1046.7.4. La chn sc chu ti cho php cho cc1076.8. Xc nh s lng cc1076.8.1. Mng M2: (di ct C2)1086.8.2. Mng M8: (di ct C8)1086.9. Kim tra b tr cc1086.9.1. Kim tra lc tc dng ln u cc mng M21086.9.2. Hiu ng nhm cc mng M21106.9.3. Kim tra lc tc dng ln u cc mng M81116.9.4. Hiu ng nhm cc Mng M81146.10. Kim tra n nh t nn1146.10.1. Kim tra mng M21146.10.2. Kim tra mng M81176.11. Kim tra ln mng cc1206.11.1. Tnh ln cho mng M21206.11.2. Tnh ln cho mng M81226.12. Kim tra iu kin ln lch gia cc mng1226.13. Tnh ton v cu to i cc:1236.13.1. Kim tra iu kin chc thng mng M21236.13.2. Kim tra iu kin chc thng mng M81246.14. Tnh ton thp cho i mng1276.14.1. Tnh ton thp cho i mng M21276.14.2. Tnh ton thp cho i mng M81296.15. Kim tra cc trong qu trnh vn chuyn v cu lp131CHNG 7 :TNH TON MNG CC KHOAN NHI1337.1. a cht1337.2. Ti trng1357.2.1. Ti trng mng M21357.2.2. Ti trng mng M81357.3. Chn loi cc v chiu su mi cc1357.4. Tnh ton sc chu ti ca cc1377.4.1. Theo cng vt liu1377.4.2. Sc chu ti cc theo ch tiu c l t nn ph lc A1387.4.1. Sc chu ti ca cc theo ch tiu cng ph lc B1407.4.2. La chn sc chu ti cho php cho cc:1437.5. Xc nh s lng cc:1437.5.1. Mng M2: (Di ct C2)1437.5.2. Mng M8: (Di ct C8)1447.6. Kim tra b tr cc:1447.6.1. Kim tra lc tc dng ln u cc mng M21447.6.2. Hiu ng nhm cc Mng M21477.6.3. Kim tra lc tc dng ln u cc mng M81477.6.4. Hiu ng nhm cc Mng M81507.7. Kim tra n nh t nn:1507.7.1. Kim tra mng M21507.7.2. Kim tra mng M81537.8. Kim tra ln mng cc:1567.8.1. Tnh ln cho mng M21567.8.2. Tnh ln cho mng M81587.9. Kim tra iu kin ln lch gia cc mng:1597.10. Tnh ton v cu to i cc1597.10.1. Kim tra iu kin chc thng mng M21597.10.2. Kim tra iu kin chc thng mng M81607.11. Tnh ton thp cho i mng1617.11.1. Tnh ton thp cho i mng M21617.11.2. Tnh ton thp cho i mng M8163CHNG 8 :PH LC TNH TON1668.1. Ni lc dm khung trc 21668.2. Ni lc ct khung trc 2201DANH MC TI LIU THAM KHO272Bo co Thit k cng trnhSVTH : Hunh Ngc Lut

GII THIU KIN TRCGii php kin trcMt bng v phn khu chc nngMt bng cng trnh hnh ch nht, chiu di 40m chiu rng 27m chim din tch t xy dng l 1080m2.

Mt bng tng in hnhCng trnh gm 10 tng gm 1 tng trt v 9 tng lu:Tng trt: cao 4.4m b tr vn phng cc cng ty, cc ca hng bun bn, qun n, dch v ph v nhu cu dn c trong chung c v ngi dn bn ngoi.Tng 1 9: b tr cc cn h phc v nhu cu . Gii php mt bng n gin, to khng gian rng b tr cc cn h bn trong, s dng loi vt liu nh lm vch ngn gip t chc khng gian linh hot rt ph hp vi xu hng v s thch hin ti, c th d dng thay i trong tng lai.Hnh khiHnh dng cao vt, vn thng kiu dng hin i, mnh m.

Mt ng cng trnhH thng giao thngGiao thng ngang trong mi n nguyn l h thng hnh lang. H thng giao thng ng l thang b v thang my b tr chnh gia nh, cn h b tr xung quanh li phn cch bi hnh lang nn khong i li l ngn nht, rt tin li, hp l v bo m thng thong.Cc loi cn hCng trnh c 2 loi cn h: Cn h 90m2

Cn h 90m2

Cn h 127 m2

Cn h 127 m2La chn gii php kt cu ph hp vi kin trcTrong cng trnh h sn c nh hng rt ln ti s lm vic khng gian ca kt cu. Vic la chn phng n sn hp l l iu rt quan trng.Ta xt phng n h kt cu sn sn: cu to bao gm h dm v bn sn. Nhc im: Chiu cao tit din dm ct ln v vng ca bn sn rt ln khi vt khu ln. khng tit kim chi ph vt liu. Khng tit kim khng gian s dng.Tuy nhin u im l tnh ton n gin.c s dng ph bin nc ta vi cng ngh thi cng phong ph nn thun tin cho vic la chn cng ngh thi cng. Trong n ny em chn phng n sn sn.H kt cu chu lc cng trnh:Bo co Thit k cng trnhSVTH : Hunh Ngc LutChn kt cu khung chu lc kt hp li thang my gia cng trnh l kt cu chu lc chnh cho cng trnh CHUNG C. Ph hp vi mt bng kin trc v nh quy m cng trnh.Chng 1 : Gii thiu kin trctrang 5D LIU THIT K S BTiu chun thit k TCVN 2737 -1995: Ti trng v tc ng - Tiu chun thit k. TCVN 5574 -2012: Kt cu b tng v b tng ct thp - Tiu chun thit k. TCVN 198 -1997 : Nh cao tng - Thit k kt cu b tng ct thp ton khi. TCVN 195- 1997 : Nh cao tng - Thit k cc khoan nhi. TCVN 205 -1998 : Mng cc - Tiu chun thit k .Chn vt liuB tng B tng s dng cho kt cu dng B25 vi cc ch tiu nh sau: Khi lng ring: = 25kN/m3. Cng tnh ton: Rb = 14.5MPa. Cng chu ko tnh ton: Rbt = 1.05MPa. M un n hi: Eb = 30 x 103MPa. Ct thp Ct thp d 10 dng cho kt cu dng loi AIII vi cc ch tiu: Cng chu nn tnh ton: Rs= 365MPa. Cng chu ko tnh ton: Rsc= 365MPa. Cng tnh ct thp ngang: Rsw = 290MPa. M un n hi: Es = 2x105MPa. Ct thp trn d n = 1.3 Khi ptc 200(daN/m2) -> n = 1.2.Gi tr hot ti c nhn vi h s gim ti quy nh trong TCVN 2737-1995. i vi nh , phng n, WC, phng lm vic, h s gim ti l :

, vi din tch phng A A1 = 9 m2 i vi phng hp, phng gii tr, ban cng, l gia, h s gim ti l:

, vi din tch phng A A1 = 36 m2 Tnh ton h s gim ti cho S1

, vi din tch 3.85 x 4=15.4 A1 = 9 m2i vi sn c din tch ln hn 9m2 th ta c xt n h s gim ti.H s gim hot ti sn in hnh snChc nngptckN/m2npttkN/m2L1L2Ssngim tipttkN/m2

S1Phng ng1.51.31.953.854.0015.400.861.67

S1APhng ng1.51.31.953.753.8514.440.871.70

S1BPhng ng1.51.31.953.904.0015.600.861.67

S2Sn phi+bp1.51.31.953.755.0018.750.821.59

S2APhng ng1.51.31.954.004.9519.800.801.57

S2BV sinh+ p n1.51.31.954.055.0020.250.801.56

S3Phng sh1.51.31.954.005.0020.000.801.56

S4Wc+ bp1.51.31.954.005.0020.000.801.56

S5APhng khch1.51.31.952.808.0022.800.781.52

S5Phng khch1.51.31.952.808.0022.800.781.52

S6Hnh lang31.23.602.808.0022.801.003.60

S7Hnh lang31.23.601.42.84.481.003.60

S tnh: Lin kt ca bn sn vi dm, tng c xem xt theo quy c sau: Lin kt c xem l ta n khi bn k ln tng. Khi bn ta ln dm b tng ct thp ( ton khi) m c hd/hb < 3. Khi bn lp ghp. Lin kt c xem l ngm theo quy c sau: Khi bn ta ln dm b tng ct thp ( ton khi) m c hd/hb 3 Lin kt l t do khi bn hon ton t do. Ty theo t l di 2 cnh ca bn, ta phn bn thnh 2 loi: Bn loi dm (L2/L1 > 2). Bn k bn cnh (L2/L1 2.Tng ti trng tc dng ln bni vi bn k 4 cnh

(kN).Ti trng tnh ton ln bn k 4 cnh. snpttgttl1l2ptt

kN/m2kN/m2mm(kN)

S11.675.103.854.00104.3

S1A1.705.103.753.8598.2

S1B1.675.103.904.00105.6

S21.597.803.755.00176.1

S2A1.575.104.004.95132.1

S2B1.567.804.055.00189.5

S31.565.904.005.00149.2

S41.569.504.005.00221.2

S73.605.101.432.8039.0

i vi bn loi dm

(kN/m) vi b = 1m.Ti trng tnh ton vi bn loi dmBN LOI DM

snptcgtcpttgttl1l2qttsanqtcsan

kN/m2kN/m2kN/m2kN/m2mmkN(kN)

S51.174.501.525.102.808.006.65.7

S5A1.174.91.525.542.808.007.16.1

S63.004.503.605.103.48.008.77.5

Tnh ct thp sn tng in hnh Vt liu s dng: B tng B25 c kh nng chu nn: Rb = 14.5Mpa, chu ko: Rbt = 1.05Mpa Thp: A-I c kh nng chu ko, nn: Rs = Rsc = 225Mpa AIII c kh nng chu ko, nn: Rs = Rsc = 365Mpa.Tnh ton c th cho 1 trng hp: bn S4L1=4m;L2=5mL2, L1: cnh di v cnh ngn ca bn.

Sn S4

bn c xem l bn k bn cnh , lc ny bn lm vic theo hai phng. Tnh ton bn n theo s n hiTy theo iu kin lin kt ca bn vi cc dm b tng ct thp l ta n hay ngm xung quanh m chn s tnh bn cho thch hp. Da vo mt bng b tr dm ta xt t s:

nn c xem l lin kt ngm. S 9S 9

Ct bn theo mi phng vi b rng b = 1m, gii vi ti phn b u tm mmen nhp v gi.

Trong : M men nhp theo phng cnh ngn l1: M1 M men nhp theo phng cnh di l2: M2 M men gi theo phng cnh ngn l1: MI M men nhp theo phng cnh di l2: MII P: tng ti trng tc dng ln bn: Vi ptt: hot ti tnh ton (kN/m2), gtt: tnh ti tnh ton (kN/m2). Tra bng cc h s: mi1, mi2, ki1, ki2 cc h s ph thuc vo t l l2/l1 tra bng 1-19 trang 32 sch S tay kt cu cng trnh( V Mnh Hng). Ni lc tnh ton:Ni lc tnh ton sn S4M1(kNm/m)M2(kNm/m)MI(kNm/m)MII(kNm/m)

4.62.910.56.7

Tnh ct thp chu moment dng M1 theo phng cnh ngn Chiu cao lm vic ca tit din: gi thit abaove=15mm S dng chng trnh Excel ta tnh chnh xc h0 bng cch gi thit trc ng knh thp

Tnh gi tr theo cng thc:

Tra bng ph lc E.2 TCXDVN 356: 2005 ng vi b tng cp B25, ct thp nhm AI:

=> =0.618 v =0.427

V < =0.427 t ct n

Tnh

Chn ct thp d6 c

Chn d6s120 b tr

Hm lng thp b tr :

Tnh ct thp chu moment dng M2 theo phng cnh diQu trnh tnh ton tng t, ch khc a. Do momen theo phng cnh ngn thng ln hn momen theo phng cnh di nn ngi ta thng t ct thp cnh ngn nm di tng h0 Chiu cao lm vic ca tit din: gi thit abaove=15mm S dng chng trnh Excel ta tnh chnh xc h0 bng cch gi thit trc ng knh thp:

Chn ct thp d6, c :

Chn d6s140 b tr.

Hm lng thp b tr:

Tnh ct thp chu moment m MI theo phng cnh ngn Chiu cao lm vic ca tit din: Gi thit abaove=15mm S dng chng trnh Excel ta tnh chnh xc h0 bng cch gi thit trc ng knh thp:

Chn ct thp d8 ,c :

Chn d8s100 b tr.

Hm lng thp b tr:

Tnh ct thp chu moment m MII theo phng cnh diTng t ta c:

Chn ct thp d8 ,c :

Chn d8s=100 b tr.

Hm lng thp b tr:

Cc trng hp cn li ca cc bn tnh ton tng t. Khi tnh thp theo gi tr m men tng nhng tin vic thi cng, n gin vic b tr thp v thin v an ton sinh vin tnh v b tr theo nguyn tc c gi tr ln hn c chn b tr cho nh. Tnh ton ct thp sn bn dm S6L1=3.4m,L2=8m

Sn S6

Bn loi dm, lc ny bn lm vic theo 1 phng. Tnh ton bn n theo s n hi. Ty theo iu kin lin kt ca bn vi cc dm b tng ct thp l ta n hay ngm xung quanh m chn s tnh bn cho thch hp.

nn c xem bn c 4 cnh ngm Ct bn theo mi phng vi b rng b = 1m, gii vi ti phn b u tm m men nhp v gi.

S tnh bn loi dmCch tnh: ct bn theo cnh ngn vi b rng b = 1m tnh nh dm c 2 u ngm:

Ti nhp: Ti gi: Tnh ct thp chu moment dng ti nhpChiu cao lm vic ca tit din: gi thit abaove=15mm. S dng chng trnh Excel ta tnh chnh xc h0 bng cch gi thit trc ng knh thp:

Chn ct thp d6 c as= 0.2826cm2

Chn d8, khong cch gia cc thanh s=140mm b tr

Hm lng ct thp b tr

Tnh ct thp chu moment m ti gi Tin hnh tnh ton tng t:

Chn ct thp d8 c as= 0.5024cm2

Chn d8, khong cch gia cc thanh s=100mm b tr

Hm lng ct thp b tr

Bng tnh ton ct thp cho sn tng in hnhMt bng sn tng in hnh

Bo co Thit k cng trnhSVTH : Hunh Ngc Lut

Chng 3 : Tnh ton sn tng in hnhtrang 34Kim tra vng snCc cu kin ni chung v sn ni ring nu c vng qu ln s nh hng n vic s dng kt cu mt cc bnh thng,gy tm l hong s cho ngi s dng. Do cn phi gii hn vng do ti trng tiu chun gy ra (tnh ton theo trng thi gii hn th hai).

Kim tra vng l mt yu cu ht sc quan trng trong thit k:.

vng gii hntnh theo LTH nh sau:

vng bn k 4 cnh vng ca bn c xc nh n gin theo cng thc sau:

Trong : l h s ph thuc vo t s (L2/L1) ca bn, tra ph lc 22 sch Kt cu b tng ct thp Tp 3. l tng ti tc dng ln sn. l chiu di cnh ngn. ( cng tr) c xc nh theo cng thc:

vi ; ; .Xt sn S4: 4000x5000 c ti trng ln nht v l c kch thc ln nht.

l tng ti tc dng ln sn:

Tha vng. vng bn loi dm vng ca bn loi dm c tnh theo cng thc sau:

Trong : .Xt sn S6: 3400x8000 c ti trng ln nht v l c kch thc ln nht.

l tng ti tc dng ln sn:

Tha iu kin vng.

TNH TON CU THANG IN HNHTng quan v cu thang trong cng trnh:Cu thang tng in hnh ca cng trnh ny l cu thang dng bn 2 v, tnh ton cu thang theo dng bn chu lc. Do c c im kt cu cng trnh c b tr li cng v tr trung tm nn ta li dng iu ny b tr cu thang b bn trong.c im cn lu l cng trnh c cc tng c chiu cao thay i, dn n chiu cao, chiu di cu thang cng khng ging nhau. Lc chn cu thang tng in hnh c chiu cao tng Ht = 3.3m thit k.Chiu cao bc l 165mm.Chiu rng bc l 250mm. Cu thang c 20 bcLa chn kt cuThang b l h kt cu gm bn thang l bn BTCT ton khi, cc bc thang l gch xy. Cu thang b trong cng trnh c la chn thit k vi kt cu c c im nh sau : Bn thang c dng gy khc : bn nghing v chiu ngh. Bn thang lin kt 2 u : mt u gi ln dm chiu ti, mt u lin kt vi vch cng khng c dm chiu ngh. Gc nghing ca cu thang:

. S b chn chiu dy bn thang: Bn lm vic nh 1 bn loi dm gy khc gm bn thang nm nghing v bn chiu ngh.

Nhp lm vic : khong cch 2 gi : L= 4.175(m). Chiu dy bn chn s b nh vi bn loi dm : t = (1/30 1/25)*L= ( 139 167) (mm), chn t = 150 (mm). Dm chiu ti Dm chiu ti c ton khi vi sn tng v c lin kt 2 u vi vch nn ct thp c neo vo vch (vch sau) Nhp dm : 2.8 (m). Kch thc dm chiu ti : cho dm ny l dm sn, khng tnh cu thang Chiu cao dm:hd = ( 1/12 1/8 )*L = (233 350 ) chn hd = 400 (mm). Chiu rng dm bd = ( 1/2 2/3 )*h= (175 233 )chn bd = 200 (mm). Chn dm D20x40 Vt liu s dng: B tng B25 :Rb = 14.5MPa; Rbt = 1.05(MPa). Thp AIII : Rs = Rsc = 365MPa; Rsw = 365(MPa). Thp AI : Rs = Rsc = 225MPa; Rsw = 175(Mpa).Ti trng tc dng ln cu thang

Ti trng trn bn thang (q1)Tnh ti: Chiu di bn thang:

Trng lng bc thang:

Bng 4.2: Ti trng cc lp cu to bn thangSTTCc lp cu toTi tiu chun (kN/m)H s vt tiTi tnh ton (kN/m)

1 hoa cng dy 2cm24 x 0.02 x 1 = 0.481.10.53

2Va XM lt dy 2cm18 x 0.02 x 1= 0.361.30.47

3Gch xy( trng lng bc thang)1.33

4Bn BTCT dy 15cm25 x 0.15 x 1= 3.751.14.13

5Va trt dy 2cm18 x 0.02 x 1= 0.361.30.47

Tng cng6.93

Hot ti: Hot ti tnh ton:

Hot ti phn b u theo chiu di bn thang:

Tng ti trng tc dng trn bn thang l: Trong tnh ti tc dng ln bn thang cn tnh n trng lng ca lan can :glc = 0.3 x 1.2 =0.36 daN/m

Ti trng trn bn chiu ngh (q2)Tnh tiSTTCc lp cu toTi tiu chun (kN/m)H s vt tiTi tnh ton (kN/m)

1 hoa cng dy 2cm24 x 0.02 x 1 = 0.481.10.53

2Va XM lt dy 2cm18 x 0.02 x 1= 0.361.30.47

3Bng BTCT dy 15cm25 x 0.15 x 1= 3.751.14.13

4Va trt dy 2cm18 x 0.02 x 1= 0.361.30.47

Tng cng5.60

Tng tnh ti tc dng trn bn chiu ngh l:g2 = g + gbn + gva = 0.53 + 4.13 + (0.47+0.47) = 5.6kN/m2.Hot ti Hot ti tnh ton:

Tng ti trng tc dng trn bn thang l:

Tnh ton bn thangS tnhKt cu cu thang tn ti rt nhiu kin tri ngc nhau trong vic chn s tnh. Trong n ny em dng s xc nh ni lc cho bn thang: s 2 gi c nh. Bn thang gm v trn v v di. V di v v trn lm vic nh 1 dm c u di lin kt vi dm sn v u trn lin kt vi vch cng. u im ca s tnh l v khng c dm chiu ngh nn khng gy ra s phn bit lm vic chung hay ring ca bn thang v chiu ngh. V vy ch cn tnh ton cho 1 s dm gy khc. Nhc im l chiu dy bn ln v nhp lm vic ln.Xt lin kt bn chiu ngh v vch: cha th xem l lin kt ngm, cha kh nng cn tr chuyn v xoay hn ch cho bn. Do iu kin thi cng, bn thang sau v c thp ni vi thp ch t vch nn v tr vch cng khng m bo l lin kt ngm. Mc khc xem v tr bn chiu ngh lin kt vi vch l gi di ng tc l c chuyn v ngang l khng hp l. T sinh vin chn s l 2 gi c nh. tnh ni lc phi dung cc chng trnh tnh kt cu ETABS hay SAP2000 , t cc gi tr momen nhp v gi tnh ct thp v b tr ti cc tit din tng ngLy Momen v tr gy khc b tr thp trn cho v tr gy khc v chiu ngh.Thp ti 2 gi b tr cu to.Bn chu lc theo mt phng, ct 1m theo phng di tnh ton. (M hnh trong SAP2000).

S tnh v biu momen 2 v cu thang:

Lc ct v phn lc gi 2 v cu thang

Chuyn v nt cu thang

Nhn xt: 2 v cu thang c hnh dng biu momen v lc ct tng t nhau thit k thp cho 1 v v b tr cho v cn liTnh ton thp cu thang tng in hnh Ni lc tnh thp:Ni lc c xut ra t SAP2000, ta c: Mnhp = 6.94(kN.m). Vt liu s dng: B tng B25 c Rb = 14.5(MPa); Rbt = 1.05(MPa); b2 = 1 Thp AIII : Rs = Rsc = 365(MPa); Rsw = 365(MPa); Thp AI : Rs = Rsc = 225(MPa); Rsw = 175(MPa);

; Tnh thp cho bn thangBn thang chu lc mt phng, ct 1m theo phng chu lc tnh nh cu kin chu un, t ct n. Tit din ch nht, b x h = 1m x hb.Chn a = 15 + 4 = 19mm (gi nh chn thp d8) ho = 150 19= 131 mm. Cng thc tnh:

Din tch thp yu cu:

Vy chn Kim tra hm lng ct thp: hm lng ct thp khng c qu nhiu trnh ph hoi dn, cng khng c qu t:

Trong :

min: Theo TCVN 5574 - 2012 min = 0.05%, thng ly min = 0.1%.

Vy cu kin b tr thp tha iu kin v hm lng ct thp.Tnh thp v tr gy khcTi v tr gy khc m men bng: Mgy khc = 7.26(kN.m).Chn a = 15 + 4 = 19mm (gi nh chn thp d8) ho = 150 19= 131 mm. Cng thc tnh:

Din tch thp yu cu:

Vy chn Kim tra hm lng ct thp: hm lng ct thp khng c qu nhiu trnh ph hoi dn, cng khng c qu t: .

min: Theo TCVN 5574 - 2012 min = 0.05%, thng ly min = 0.1%.

Vy Cu kin b tr thp tha iu kin v hm lng ct thp. Ct thp theo phng ngang bn thang v chiu ngh cu to d6s200. Ct thp ti gi b tr cu to : chn d8s200 b tr cho 2 gi v ti v tr gy khc. B tr thp xem bn v KC02Bo co Thit k cng trnhSVTH : Hunh Ngc Lut

Chng 4 : Tnh ton cu thang in hnhtrang 45TNH TON CT THP KHUNG TRC 2Chn kch thc tit dinChn tit din ctDin tch tit din ct xc nh s b nh sau:

[4] Trong : Rb l cng chu nn b tng. Vi b tng cp bn B25 th Rb=14500(kN/m2) kt =1.11.5 h s xt n nh hng khc nh mmen un, hm lng ct thp, mnh ca ct.Xt s nh hng ny theo kinh nghim ca ngi thit k. Chn s b = 1.1 N: lc nn c tnh ton gn ng nh sau: N = nt.q.Fxq nt: s sn pha trn tit din ang xt (k c mi). Fxq: din tch mt sn truyn ti trng ln ct ang xt. q l ti trng tng ng gm ti trng thng xuyn v tm thi trn bn sn, trng lng dm, tng, ct em tnh phn b u trn sn. Gi tr q c ly theo kinh nghim thit k: q= [ 1014 ] kN/m2 Vi sn c b dy 12 cm ta chn q = 13 kN/m2 [4] Cng thc (1-3) trang 20 sch tc gi Nguyn nh Cng, Tnh ton tit din ct b tng ct thp, Nh xut bn xy dng, 2011

Bng s b chn tit din ct giaChn s b tit din ct gia.

TNGFxqqnNktF cotb s bh s bFcot s bb hiu chnhh hiu chnhFcot hiu chnh

m2kN/m2kNcm2cmcmcm2cmcmcm2

ST721319361.17107070490040602400

97213218721.114207070490040602400

87213328081.121307070490040602400

77213437441.128408080640040602400

67213546801.135508080640040602400

57213656161.142608080640050703500

47213765521.149708080640050703500

37213874881.156819090810050703500

27213984241.163919090810060804800

172131093601.171019090810060804800

TRT721311102961.178119090810060804800

Bng s b chn tit din ct binChn s b tit din ct bin



ST361314681.13554050200040502000

9361329361.17104050200040502000

83613314041.110654050200040502000

73613418721.114204050200040502000

63613523401.117755060300040602400

53613628081.121305060300040602400

43613732761.124855060300040602400

33613837441.128406070420050703500

23613942121.131956070420050703500

136131046801.135506070420050703500

TRT36131151481.139056070420050703500

Bng s b chn tit din ct gcChn s b tit din ct gc



ST181312341.11784050200040502000

9181324681.13554050200040502000

8181337021.15334050200040502000

7181349361.17104050200040502000

61813511701.18884060240040602400

51813614041.110654060240040602400

41813716381.112434060240040602400

31813818721.114205070350050703500

21813921061.115985070350050703500

118131023401.117755070350050703500

TRT18131125741.119535070350050703500

Kch thc tit din dm v ct khung trc 2Chn tit din dm v vch thang my Vch thang my c chiu dy 300mm theo phng di v 350mm theo phng ngn cng trnh. S tnh ca cng trnh l khung khng gian. i vi khung b tng ct thp ton khi, lin kt gia ct mng l lin kt ngm; lin kt gia ct dm xem l nt cng. Ct ngm ti mt trn ca mng. Vic m hnh trong chng trnh Etabs c thc hin nh sau: Ct v dm c m hnh bng phn t Frame. Vch v sn c m hnh bng phn t Shell. Trng lng bn thn ca kt cu do Etabs t tnh ton. Trng lng cc lp cu to sn c phn b u trn sn. Trng lng bn thn tng c gn thnh phn b u i vi cc tng qui i phn chng sn trn sn. Cn i vi cc tng trn dm s c gn ln dm.Ti trng tc dngGm: ti trng ng v ti trng ngang.Ti trng ngTnh ti hon thin sn Tnh ti: trng lng bn thn sn ta phn mn Etabs t tnh ta ch nhp cc lp cu to hon thin, h thng k thut,tng xy trn sn c qui i sang phn b u ln sn v c cng vi cc lp hon thin ca sn c th:Ti hon thin sn cn hCu to cc lpsn cn hChiudy(mm)Trng lngring(kN/m3)H snTnh ton(kN/m2)

Lp gch lt nn10201.10.22

Lp va lt gch40181.30.94

Lp va trt trn15181.30.35

H thng k thut1.10.33

Tng ti phn hon thin sn in hnh g1=1.8

Ti hon thin sn v sinhCu to cc lpsn v sinhChiu dy(mm)Trng lngring(kN/m3)H snTnh ton(kN/m2)

Lp gch lt nn20201.10.44

Lp va lt gch,chng thm to dc50181.31.17



Tng ti phn hon thin sn v sinh g2=2.3

Ti hon thin sn sn thngCu to cc lpsn sn thngChiudy(mm)Trng lngring(kN/m3)H snTnh ton(kN/m2)

Lp gch chng nng30221.10.73

Lp va lt gch,chng thm to dc50181.31.17



Tng ti hon thin sn sn thng g3=2.6

Tnh ti tng t trc tip trn sn Cng thc quy i ti tng t trn sn:

Trong : t: b rng tng (m). ht: chiu cao tng (m). lt : chiu di tng (m). t : trng lng ring ca tng xy gn ng n gin tnh ton l 18 (kN/m3) Ssan : din tch sn c tng (m2). nt: h s vt ti ca tng ly gn ng n gin tnh ton l 1.1Ti tng trn sn tng in hnh snhtltssanngtttuong

(m)(m)(m2)(kN/m3)(kN/m2)

S20.13.188.0918.75181.12.7

S2B0.13.188.2020.25181.12.5

S30.13.182.5020.25181.10.8

S40.13.1813.0620.25181.14.1

S5A0.13.181.6022.80181.10.44

Ti trng trn sn trt snhtltssanngtttuong

(m)(m)(m2)(kN/m3)(kN/m2)

S20.14.288.0918.75181.13.7

S2B0.14.288.2020.25181.13.4

S30.14.282.5020.25181.11.0

S40.14.2813.0620.25181.15.5

S5A0.14.281.6022.80181.10.60

Trn sn thng xem nh khng c tng t trn sn ch c tng bao che 1m t trn dm bin. o trn kin trc ta c chiu di tng ngn b tr trn sn nh sau: S2: ltuong= 2.10.9+2+3.4+0.5+0.3 = 8.09m Ssan : 3.75 x 5 =18.75 m2 S2B: ltuong= 3+0.6+2.1+2.1+0.4 = 8.20mSsan : 4.05 x 5 =20.25 m2 S3: ltuong= 2.5mSsan : 4.05 x 5 =20.25 m2

S4: ltuong= 3.8+3.80.9+3.80.8+0.9+0.3+1.6=13.06mSsan : 4.05 x 5 =20.25 m2 S5A: ltuong=1.6mSsan : 2.85 x 8 =22.8 m20.9 l h s c xt gim do tng 110 c 1 ca.H s gim nu c ca ca tng trn snLoiH s gim khi c ca ca tng

1 ca (s+i)2 ca (s+i)

Tng 1100.90.8

Tng 2200.80.7

Trong sn S2B; S4 va c sn v sinh va sn cn h. n gin trong tnh ton ta ly tnh ti l gi tr trung bnh theo phn trm din tch:

sn S2B:

A1= 2.23=6.6 m2

A2=4.055-6.6=13.65m2 sn S4:

A1= 3.73.2=11.84 m2

A2= 4.055-11.84=8.41m2

Tnh ti tc dng ln trn sn tng in hnh v sn tng trtSn tng in hnhSn tng trt

snghoanthiensangtttuongghoanthien snghoanthiensangtttuongghoanthien

(kN/m2)(kN/m2)(kN/m2)(kN/m2)(kN/m2)(kN/m2)

S11.801.80S11.801.80

S1A1.801.80S1A1.801.80

S1B1.801.80S1B1.801.80

S21.802.74.50S21.803.75.50

S2A1.801.80S2A1.801.80

S2B1.962.54.50S2B1.963.45.40

S31.800.82.60S31.801.02.80

S42.094.16.20S42.095.57.60

S5A1.800.442.24S5A1.800.602.40

S51.81.80S51.81.80

S61.801.80S61.801.80

S71.801.80S71.801.80

Tnh ti tng trn dm Ti trng tng gch tiu chun ngn gn theo cng thc: Tng n 110mm: Tng i 220mm: Gii thch: Tng bao : T220, 2 lp gch ng 2x80 = 160mm, khong cch 2 lp gch l 20mm cu to l 2 lp va 2 bn dy 20mm. Tng cng tng dy 220mm.

Tng ngn : T110, 1 lp gch ng 80mm, cu to l 2 lp va 2 bn dy 15mm. Tng cng tng dy 110mm.

n1 = 1.1 l h s vt ti n gin ta khng xt h s gim ti tng khi c ca. Tng trt cao 4.4m Tng 110mm ngn chia cc phng trong cn h:

Tng n 110mm: Tng trn dm D200x400

Tng trn dm D300x600

Tng trn dm D350x800

Tng i 200mm ngn chia cc cn h:

Tng i 220mm: Tng trn dm D200x400

Tng trn dm D300x600

Tng trn dm D400x800 v D350x800

Tng in hnh 3.3m (tng 1-9) Tng 110mm ngn chia cc phng trong cn h:

Tng n 110mm: Tng trn dm D200x400

Tng trn dm D300x600

Tng trn dm D350x800

Tng i 200mm ngn chia cc cn h:

Tng i 220mm: Tng trn dm D200x400

Tng trn dm D300x600

Tng trn dm D400x800

Tng sn thng Trn sn thng xy tng lan can 220mm chiu cao ly bng 1m Tng i 220mm: Ngoi ra: tnh ti tc dng ln khung cn trng lng bn thn ct v vch nhng trng lng bn thn sn, dm, ct, vch c Etabs t tnh nn ta b qua khng tnh.Hot ti s dng ln sn n gin ta chn hot ti s dng ca sn tng trt v in hnh bng nhau, hot ti tiu chun sn thng ly bng 400daN/m2 Gi tr hot ti c chn da theo chc nng s dng ca cc loi phng. H s tin cy n i vi ti trong phn b u xc nh theo iu 4.3.3 trang 15 TCVN 2737- 1995: Khi ptc < 200(daN/m2) -> n = 1.3 Khi ptc 200(daN/m2) -> n = 1.2. Gi tr hot ti s dng c nhn vi h s gim ti c quy nh trong TCVN 2737-1995. i vi nh , phng n, WC, phng lm vic, h s gim ti l :

, vi din tch phng A A1 = 9 m2 i vi phng hp, phng gii tr, ban cng, l gia, h s gim ti l:

, vi din tch phng A A1 = 36 m2 Tnh ton h s gim ti cho S1

, vi din tch phng 3.85 x 4=15.4 A1 = 9 m2 i vi sn c din tch ln hn 9m2 th ta c xt n h s gim ti.Xt h s gim ti cho hot ti sn snChc nngptckN/m2npttkN/m2L1L2Ssngim tipttkN/m2

S1Phng ng1.51.31.953.854.0015.400.861.67

S1APhng ng1.51.31.953.753.8514.440.871.70

S1BPhng ng1.51.31.953.904.0015.600.861.67

S2Sn phi+bp1.51.31.953.755.0018.750.821.59

S2APhng ng1.51.31.954.004.9519.800.801.57

S2BV sinh+ p n1.51.31.954.055.0020.250.801.56

S3Phng sh1.51.31.954.005.0020.000.801.56

S4Wc+ bp1.51.31.954.005.0020.000.801.56

S5APhng khch1.51.31.952.858.0022.800.781.52

S5Phng khch1.51.31.952.858.0022.800.781.52

S6Hnh lang31.23.602.858.0022.801.003.60

S7Hnh lang31.23.601.62.84.481.003.60

Ti trng ngang Tnh ton ch xt n ti trng gi tnh tc dng vo cng trnh Chn khu vc TP H Ch Minh Khu vc ni thnh TP H Ch Minh thuc vng II-A, p lc gi tiu chun

Tuy nhin, do cng trnh nm v tr t chu nh hng ca bo nn p lc gi tiu chun c gim xung cn H s kh ng H s cao k l h s tnh n s thay i ca p lc gi theo cao, ly theo bng 5, TCVN 2737-1995 hoc bng cng thc ng vi dng a hnh B:

Chiu cao mt n gi: Lc gi tnh tc dng: vi :H s tin cy ca ti trng gi

: Lc trn n v din tch Tngzj(m)k(zj)B rng nB rng nChiu caoLc giLc gi

gi phng Ygi phng Xmt n giphng Xphng Y

D(m)L(m)H(m)Fx(kN)Fy(kN)

Trt1.20.68340273.487.43129.52

15.60.90140273.85130.6193.48

28.90.97940273.3121.63180.2

312.21.03640273.3128.71190.69

415.51.08240273.3134.43199.15

518.81.12040273.3139.15206.15

622.11.15340273.3143.25212.22

725.41.18240273.3146.85217.56

828.71.20940273.3150.21222.53

9321.23340273.3153.19226.95

Sn thng35.31.25540271.6577.96115.50

Cch nhp ti gi vo m hnh cng trnh:V ti trng gi c gn di dng cc lc tp trung t ti cao trnh cc tng, nn tnh ni lc ta nhp vo m hnh cng trnh cc lc tp trung ca thnh phn gi tnh t ti tm hnh hc. nh ngha ti gi tnh l ti WIND trong ETABS, s dng chc nng User Define gn cc lc tp trung vo cc ta tm hnh hc trn sn cng mi tngT hp ti trng, ni lc, chuyn vCc trng hp ti trngTTTI TRNGLOAD NGHA

1TTDEADTnh ti v ti trng bn thn cng trnh

2HTTCLIVEHot ti cch tng chn

3HTTLLIVEHot ti cch tng l

4GXWINDThnh phn gi tnh theo phng X

5GYWINDThnh phn gi tnh theo phng Y

Cu trc t hpCc t hp ti trngSTTTTHTTCHTTLGXGY

111

211

3111

411

51-1

611

71-1

810.90.9

910.9-0.9

1010.90.9

1110.9-0.9

1210.90.9

1310.9-0.9

1410.90.9

1510.9-0.9

1610.90.90.9

1710.90.9-0.9

1810.90.90.9

1910.90.9-0.9

EVE1Bao t 1-19: Thit k thp dm v sn

201/1.1=0.9091/1.2=0.8330.833Kim tra vng dm v sn

210.9090.833

220.909-0.833

230.9090.833

240.909-0.833

250.9090.8330.8330.833

260.9090.8330.833-0.833

270.9090.8330.8330.833

280.9090.8330.833-0.833

EVE2Bao t 21- 28: Kim tra chuyn v ngang nh

Kim tra m hnh theo TCXD198-1997Kim tra tnh hp l ca m hnh

Lc dc chn ct khung trc 2 trng hp combo 3

Kim tra ti ti chn ctnh gi s b

Ct khung trc 2LoadNm hnhNs bsai s %

Ct bin C2COMB36174.3514820

Ct gia C8COMB310397102961

Nhn xt: vic c lng s b tng lc dc ti chn ct C8 sai s 1% m bo vic m hnh tng i chp nhn c. Ring ct C2 nm bin chu ti trng tng 220 v cc dm bin kch thc ln kh nhiu nn c lng 13kN/m2 c th cha ng c th l 14kN/m2 th s b Ns b=5544 KN chnh lch vi Nm hnh=6174.3kN l 11% . kt qu m hnh c th tin cy. Cc trng hp ti trng thng ng (tnh ti v hot ti) th biu c dng i xng ( cng trnh i xng) Cn bng nt trong c hc kt cu c p ng.Tnh ton v b tr thp dm khung trc 2Chn t hp bao ni lc (ENVE1) tnh thp cho dm. Dm khung trc 2 gm:B16 (t trc A -> B)B37 (t trc B -> C) B58 (t trc C -> D) Do mt bng cng trnh i xng, khi gii ni lc c gi tr gn nhau nn em chn tnh thp v b tr sao cho dm B16, B58 ging nhau thun tin cho thi cng.

Ni lc momen dm khung trc 2Tnh ton dm c th B16

V tr nh v dm B16

Ni lc Dm B16 Tng 1StoryBeamLoadLocV2M3

TANG 1B16EVE1 MAX0-297.6-533.5

TANG 1B16EVE1 MAX1-280.5-244.4

TANG 1B16EVE1 MAX1-254.2-241.7

TANG 1B16EVE1 MAX2-237.13.9

TANG 1B16EVE1 MAX2-199.66.0

TANG 1B16EVE1 MAX3-182.5197.1

TANG 1B16EVE1 MAX3-145.8198.6

TANG 1B16EVE1 MAX4-128.7335.9

TANG 1B16EVE1 MAX4-103.6336.9

TANG 1B16EVE1 MAX4.5-95.1386.6

TANG 1B16EVE1 MAX5-86.5432.0

TANG 1B16EVE1 MAX5178.9426.4

TANG 1B16EVE1 MAX6196.0238.9

TANG 1B16EVE1 MAX6216.9237.0

TANG 1B16EVE1 MAX7234.011.5

TANG 1B16EVE1 MAX7263.49.1

TANG 1B16EVE1 MAX8280.5-262.8

TANG 1B16EVE1 MAX8309.0-265.6

TANG 1B16EVE1 MAX9326.1-583.1

TANG 1B16EVE1 MIN0-297.6-533.5

TANG 1B16EVE1 MIN1-280.5-244.4

TANG 1B16EVE1 MIN1-254.2-241.7

TANG 1B16EVE1 MIN2-237.13.9

TANG 1B16EVE1 MIN2-199.66.0

TANG 1B16EVE1 MIN3-182.5197.1

TANG 1B16EVE1 MIN3-145.8198.6

TANG 1B16EVE1 MIN4-128.7335.9

TANG 1B16EVE1 MIN4-103.6336.9

TANG 1B16EVE1 MIN4.5-95.1386.6

TANG 1B16EVE1 MIN5-86.5432.0

TANG 1B16EVE1 MIN5178.9426.4

TANG 1B16EVE1 MIN6196.0238.9

TANG 1B16EVE1 MIN6216.9237.0

TANG 1B16EVE1 MIN7234.011.5

TANG 1B16EVE1 MIN7263.49.1

TANG 1B16EVE1 MIN8280.5-262.8

TANG 1B16EVE1 MIN8309.0-265.6

TANG 1B16EVE1 MIN9326.1-583.1

Ni lc tnh thp cho dm B16 sau khi lc ni lcTNGDMT HPMT CTmhbVmaxM3

(cm)(cm)kNkNm

TANG 1B16-(Mmin)EVE1 MIN97040326.1-583.1

TANG 1B16-(Mmax)EVE1 MAX57040432.0

TANG 1B16-(Mmin)EVE1 MIN07040-533.5

Cc thng s tnh tonc trng vt liu-materialCc h s

Ct thpRsRscRswEs (MPa)R =0.563R =0.405min =0.05max =2.24

AIII365365290200000

Ct aiRsRscRswEs (MPa)

AI225225175210000

B tngRbRbtbEb (MPa)

B2514.51.05130000

Tnh thp gi trc A Chn dm B16 (A -> B) tng 1 tnh ton: dm B40x70(cm); S dng chng trnh excel tnh ton gii v b tr trc 2 lp 5d25 + 2d25. Cho b tng bo v =25mm , ct ai d8 Lp 1 : 5d25 c As1=24.5 cm2 c a1=25+8+25/2=50.5mm=4.55cm Lp 2: 2d25 c As2=9.8 cm2 c a2=25+8+25+30+25/2=105.5mm=10.05cm

ho = 70 - 6.12= 63.88cm

Chn 5d25 + 2d25, As = 34.4 (cm2).min: Theo TCVN 5574 - 2012 min = 0.05%, thng ly min = 0.1%.Tnh thp nhp S dng chng trnh excel tnh ton gii v b tr trc 2 lp 5d25 Cho b tng bo v =25mm , ct ai d8 Lp 1 : 5d25 c As1=24.5 cm2 c a1=25+8+25/2=50.5mm=4.55cma=a1=4.55cmho = 70 4.55= 65.45cm

Chn 3d25+2d25: As = 24.5(cm2).

min: Theo TCVN 5574 - 2012 min = 0.05%, thng ly min = 0.1%.Tnh thp gi phi trc B Tng t gi tri chn a =6.12 cm; ho = 70 - 6.12= 63.88cm

Chn 5d25 + 2d25: As = 34.4(cm2)

min: Theo TCVN 5574 - 2012 min = 0.05%, thng ly min = 0.1%.Tnh thp ai cho dm khung trc 2 Nhn xt: i vi dm khung ang tnh ton, ta nhn thy lc ct cc dm c gi tr lc ct max tng ng nhau nn ta chn dm c gi tr Qmax ln nht tnh ton ct ai v b tr cho cc dm trong khung trc 2 cn li.

Tnh thp ai: chn ai 2 nhnh :T kt qu xut bng etab ta co lc ct V2 max ca Dm B37nh sau: StoryBeamLoadLocV2

TANGTRETB37COMB19381

V2max = Qmax= 381 (kN) Theo kt qu tnh ton Dm B37 Tng Trt th c a=6.6cm

Qbmin = Qbmin =0.6(1+0+0)11.05103 0.40.634=160(kN)

Vy Qmax = 381kN > Qbmin = Do b tng khng chu lc ct ta phi tnh ct ai chu lc ct.Chn ct ai d8, 2 nhnh (asw = 0.503(cm2))Xc nh bc ct ai nh sau: Khong cch tnh ton gia cc ct ai:

Chn Sct = 233(mm) (on gn gi ta )

an ton ly

Chn Sct = 500(mm) ( on gia nhp) an ton ly Vy chn s = 150 (mm) b tr trong on L/4 mm u dm v s = 250 (mm) b tr cho on gia dm cn li. Kim tra li :

Qbt = 0.31.080.85514.51030.40.634 = 1019 (kN)

Vy: Qmax = 381 (kN) < Qbt = Kt lun : Vy h dm y khng b ph hoi do ng sut nn chnh. Kh nng chu ct ca ct ai v b tng:

Vi Tnh ct treo ti v tr dm ph gc ln dm chnh

Hnh 4.20 S tnh ton ct thp treo.V tr dm tnh ct treo: dm ph gc ln dm chnh. Ti v tr dm ph gc ln dm chnh c lc ct ln cn b tr ct treo. Ta c: b = 300(mm) l b rng phm vi tc dng ca lc tp trung. hs l chiu cao thp, bng khong cch t y dm ph n ct thp chu ko ca dm. S l phm vi cn t ct thp treo chng s ph hoi theo hnh thp.Dm (300x600) gc ln dm (400x700), lc tp trung t dm ph tc dng ln dm chnh l P1 = 190kN. Gi tr lc P1 c ly trong tnh ton khung etabs.Gi tr lc tnh ton ct treo

StoryBeamLoadLocP1=V2 (Kn)

TANG TRETB16COMB195190

TANG 1 TANG 9B16COMB195183

SAN THUONGB16COMB35147

TANG TRETB37COMB16.15295

TANG 1 TANG 9B37COMB156.15262

SAN THUONGB37COMB16.15229

Tnh ton cho dm B16,B58 chn P1=190kN

Din tch ct treo cn thit l: Din tch ct treo: Ftreo = Vi: P1 = 190(kN) S ct treo cn thit: m = Ta khng th b tr ct treo theo kiu ct ai 11 ai d8 vi din tch 10.9cm2 trong khong 36mm. Ta i tnh ct treo vai b.

Chn 3d18 c b tr cho B16 v B37 ti v tr dm phTnh ton cho dm b37 chn P1=295kN

Chn 3d20 c b tr cho B37 ti v tr dm phBo co Thit k cng trnhSVTH : Hunh Ngc Lut

Chng 5 : Tnh ton ct thp khung trc 2 trang 71Bng tnh thp dm B16, B37,B58 khung trc 2TNGK hiu dmT hpV tr(m)hcmbcmVkNMkN.macmhocmmAS (cm)Tnh tonChn thpAs (cm)chn

TANG TRETB16-(Mmin)EVE1 MIN97040309.0-600.66.163.90.2540.29830.35d25+2d2534.41.3

TANG TRETB16-(Mmax)EVE1 MAX57040-91.9505.06.463.60.2150.24524.84d25+2d2529.51.2

TANG TRETB16-(Mmin)EVE1 MIN07040-357.6-686.46.663.40.2950.35936.25d25+3d2539.31.5


TANG TRETB37-(Mmax)EVE1 MAX4.57040-2.1333.74.665.40.1340.14515.14d2519.60.7



TANG TRETB58-(Mmax)EVE1 MAX47040115.9505.36.463.60.2150.24524.84d25+2d2529.51.16


TANG 1B16-(Mmin)EVE1 MIN97040272.1-583.16.163.90.2460.28829.25d25+2d2534.41.34

TANG 1B16-(Mmax)EVE1 MAX57040-72.5443.84.665.40.1790.19820.65d2524.50.94

TANG 1B16-(Mmin)EVE1 MIN07040-316.4-610.86.163.90.2580.30430.95d25+2d2534.41.34


TANG 1B37-(Mmax)EVE1 MAX4.570401.5298.64.665.40.1200.12813.44d2519.60.75



TANG 1B58-(Mmax)EVE1 MAX47040103.4444.14.665.40.1790.19820.65d2524.50.94










































































SAN THUONGB16-(Mmin)EVE1 MIN97040176.6-356.74.665.40.1440.15616.24d2519.60.75

SAN THUONGB16-(Mmax)EVE1 MAX57040-64.7520.66.163.90.2200.25225.55d25+2d2534.41.34

SAN THUONGB16-(Mmin)EVE1 MIN07040-320.7-596.36.163.90.2520.29630.05d25+2d2534.41.34

SAN THUONGB37-(Mmin)EVE1 MIN97040167.8-555.66.163.90.2350.27227.65d25+2d2534.41.34

SAN THUONGB37-(Mmax)EVE1 MAX4.5704016.7245.74.665.40.0990.10410.83d2514.70.56

SAN THUONGB37-(Mmin)EVE1 MIN07040-289.9-556.26.163.90.2350.27227.65d25+2d2534.41.34

SAN THUONGB58-(Mmin)EVE1 MIN97040188.1-595.06.163.90.2510.29529.95d25+2d2534.41.34

SAN THUONGB58-(Mmax)EVE1 MAX47040124.8519.76.163.90.2200.25125.55d25+2d2534.41.34

SAN THUONGB58-(Mmin)EVE1 MIN07040-284.6-357.24.665.40.1440.15616.24d2519.60.75


Chng 5 : Tnh ton ct thp khung trc 2 trang 95Tnh ton v b tr thp ct khung trc 2Do cng trnh i xng nn tnh ton ct C2; C8; C12;C16 chn thp ct C2 btr thp cho ct C16, thp ct C8 b tr cho ct C12 (gi tn theo m hnh ETABS).

Mt bng nh v ct trong m hnh

Kch thc ct khung trc 2Vt liuB tng B25 c Rn = 14.5 MPa, Rbt = 1.05 MPaThp AIII (d10): Rs = Rsc = 365MPa, RSW = 290 MPaThp AI (d10) : Rs = Rsc = 225MPa, RSW = 175 MPaL thuyt tnh ton Tnh ct dc:Tnh ton theo phng php gn ng da trn vic bin i trng hp nn lch tm xin thnh lch tm phng tng ng tnh ct thp. Nguyn tc ca phng php ny c GS. NGUYN NH CNG da trn nguyn tc lp ra cc cng thc ph hp TCXDVN356 2005.Xem lin kt gia sn v ct l lin kt cng(nh nhiu tng trn 2 nhp):

mnh theo 2 phng : mnh: lch tm ngu nhin:

lch tm thc t:

Lc nn ti hn: ; Vi h s un dc:

th ly h s un dc:

th ly h s un dc:

v Theo l thuyt: tng quan gia gi tr Mx1, My1 vi kch thc cc cnh m a v mt trong 2 m hnh tnh ton (theo phng x hoc y). iu kin v k hiu theo bng sau:

M hnhTheo phng xTheo phng y

iu kin

K hiuh = Cx ; b = CyM1 = Mx1 ; M2 = My1ea= eax + 0.2eayh = Cy ; b = CxM1= My1 ; M2 = Mx1ea= eay + 0.2eax

Chn a = h/10 => ho = h a; Z = h 2a Tnh theo trng hp ct thp i xng: H s chuyn i m0:

Tnh m men tng ng (i nn lch tm xin thnh lch tm phng): lch tm: Kt cu siu tnh: Kt cu tnh nh: Da vo lch tm eo v gi tr x1 phn bit cc trng hp tnh ton: Trng hp 1: nn lch tm rt b H s nh hng lch tm: H s un dc ph thm khi xt nn ng tm: Vi

Din tch ton b ct thp dc:

Trng hp 2: v Nn lch tm b

Chiu cao vng nn:; Din tch ton b ct thp dc:

Trng hp 3: v Nn lch tm ln Din tch ton b ct thp dc: Vi k = 0,4: h s k n do ct thp dt theo chu vi.Nhn xt kt qu: Gi tr ct thp c th m hoc dng, ct thp m th tit din ct qu ln nn ta gm kch thc tit din ct hoc cp bn b tng hoc b tr thp cu to. Ct thp dng:Tnh hm lng ct thp

Sau khi tnh ton ra din tch thp, ta phi kim tra li hm lng thp:

Tnh ton ct c th ct C2 Tng trtChn ct C2 tng trt (50x70)cm2 tnh thp:Tnh ton vi 3 trng hp, sau chn trng hp thp ln nht b tr cho ct:(Nmax, MXtu, MYtu)(MXmax, MYtu, Ntu) (MYmax, MXtu, Ntu) Bng ni lc ct C2Sau b tr chung cho 3 tng tin thi cng khi hm lng thp gn bng nhau.StoryColumnLoadLocPV2V3M2M3

TANG TRETC2COMB10.00-5876.74.4-145.7-151.25.4

TANG TRETC2COMB11.65-5860.84.4-145.789.2-1.9

TANG TRETC2COMB13.30-5844.94.4-145.7329.6-9.1

TANG TRETC2COMB20.00-5709.43.6-123.0-127.84.5

TANG TRETC2COMB21.65-5693.53.6-123.075.1-1.4

TANG TRETC2COMB23.30-5677.63.6-123.0278.1-7.3

TANG TRETC2COMB30.00-6174.34.2-142.5-147.95.3

TANG TRETC2COMB31.65-6158.44.2-142.587.2-1.7

TANG TRETC2COMB33.30-6142.54.2-142.5322.3-8.6

TANG TRETC2COMB40.00-5410.55.9-126.0-130.79.7

TANG TRETC2COMB41.65-5394.75.9-126.077.20.0

TANG TRETC2COMB43.30-5378.85.9-126.0285.2-9.8

TANG TRETC2COMB50.00-5413.11.6-126.3-131.2-0.3

TANG TRETC2COMB51.65-5397.21.6-126.377.2-3.1

TANG TRETC2COMB53.30-5381.31.6-126.3285.6-5.8

TANG TRETC2COMB60.00-5309.03.8-117.5-103.14.7

TANG TRETC2COMB61.65-5293.13.8-117.590.8-1.6

TANG TRETC2COMB63.30-5277.23.8-117.5284.8-7.9

TANG TRETC2COMB70.00-5514.73.7-134.8-158.84.7

TANG TRETC2COMB71.65-5498.83.7-134.863.6-1.5

TANG TRETC2COMB73.30-5482.93.7-134.8286.0-7.7

TANG TRETC2COMB80.00-5829.16.3-143.6-148.99.9

TANG TRETC2COMB81.65-5813.26.3-143.688.0-0.5

TANG TRETC2COMB83.30-5797.36.3-143.6325.0-10.8

TANG TRETC2COMB90.00-5831.32.4-143.9-149.30.8

TANG TRETC2COMB91.65-5815.52.4-143.988.0-3.2

TANG TRETC2COMB93.30-5799.62.4-143.9325.4-7.2

TANG TRETC2COMB100.00-5737.64.4-136.0-124.15.4

TANG TRETC2COMB101.65-5721.74.4-136.0100.3-1.9

TANG TRETC2COMB103.30-5705.94.4-136.0324.6-9.1

TANG TRETC2COMB110.00-5922.84.3-151.5-174.25.3

TANG TRETC2COMB111.65-5906.94.3-151.575.8-1.8

TANG TRETC2COMB113.30-5891.04.3-151.5325.8-8.9

TANG TRETC2COMB120.00-5678.55.5-123.2-127.99.1

TANG TRETC2COMB121.65-5662.65.5-123.275.40.0

TANG TRETC2COMB123.30-5646.75.5-123.2278.6-9.1

TANG TRETC2COMB130.00-5680.81.7-123.4-128.30.0

TANG TRETC2COMB131.65-5664.91.7-123.475.4-2.8

TANG TRETC2COMB133.30-5649.01.7-123.4279.0-5.5

TANG TRETC2COMB140.00-5587.13.6-115.5-103.04.5

TANG TRETC2COMB141.65-5571.23.6-115.587.6-1.4

TANG TRETC2COMB143.30-5555.33.6-115.5278.2-7.4

TANG TRETC2COMB150.00-5772.23.6-131.1-153.14.5

TANG TRETC2COMB151.65-5756.33.6-131.163.1-1.3

TANG TRETC2COMB153.30-5740.43.6-131.1279.4-7.2

TANG TRETC2COMB160.00-6096.96.1-140.7-146.09.7

TANG TRETC2COMB161.65-6081.06.1-140.786.2-0.3

TANG TRETC2COMB163.30-6065.16.1-140.7318.4-10.3

TANG TRETC2COMB170.00-6099.22.2-141.0-146.50.7

TANG TRETC2COMB171.65-6083.32.2-141.086.2-3.0

TANG TRETC2COMB173.30-6067.42.2-141.0318.8-6.8

TANG TRETC2COMB180.00-6005.44.2-133.1-121.25.2

TANG TRETC2COMB181.65-5989.64.2-133.198.4-1.7

TANG TRETC2COMB183.30-5973.74.2-133.1318.0-8.6

TANG TRETC2COMB190.00-6190.64.1-148.6-171.35.2

TANG TRETC2COMB191.65-6174.74.1-148.673.9-1.6

TANG TRETC2COMB193.30-6158.84.1-148.6319.2-8.5

Bng t hp ni lc ct C2TngT HpLocNM22MxM33MyTrng hp

mkNkN.mkN.m

TANG TRETCOMB190-6190.6-171.35.2(Nmax, MXtu, MYtu)

TANG TRETCOMB13.3-5844.9329.6-9.1(MXmax, MYtu, Ntu)

TANG TRETCOMB83.3-5797.3325.0-10.8(MYmax, MXtu, Ntu)

Tnh thp dc cho trng hp 2: (Mxmax, Mytu, Ntu)

Mxmax = 329.6(kN.m); Mytu = 9.1(kN.m); Ntu = 5844.9(kN); Xem lin kt gia sn v ct l lin kt cng nn:

lch tm ngu nhin:

mnh theo 2 phng : mnh: T mnh ta xem st ct c cn tng moment do b nn un hay khng.

Vi h s un dc: th ly h s un dc: Mmen sau khi gia tng:

Ty theo tng quan gia cc gi tr vi kch thc cc cnh m a v 1 trong 2 m hnh tnh ton theo x hay y V , nn tnh theo phng yh=Cyb=CxM1=My1(kN.m)M2=Mx1(KN.m)Gi thit aho(cm)Z(cm)

7050329.69.1470-4=6670-2x4=62

Tin hnh tnh ton theo trng hp t thp i xng:

H s chuyn i m0:

v x1> h0 nn Tnh m men tng ng (i nn lch tm xin thnh lch tm phng).

lch tm:

Tnh ton theo trng hp lch tm rt b, tnh ton gn nh nn ng tm: H s nh hng lch tm:

H s un dc ph thm khi xt nn ng tm:

Vi

Din tch ton b ct thp dc:

Cc trng hp cn li tnh ton tng t.Tnh ton v b tr ct thp ai ctStoryColumnLoadLocPV2V3M2M3

TANG 3C2COMB190-4369.78-1.66552-228.439-356.2-2.7605

Lc ct ln nht ti chn ct t bng ni lc Qmax = 228.4(kN) COMB19

Qbmin = Qbmin =0.6(1+0+0)11.05103 0.50.66=208(kN)

Vy Qmax = 228.4kN > Qbmin = =208kN Do b tng khng chu lc ct ta phi tnh ct ai chu lc ct.Chn ct ai d8, 2 nhnh (asw = 0.503(cm2)) Xc nh bc ct ai nh sau: Khong cch tnh ton gia cc ct ai:

B tr ai: Ct thp ngang trong ct c tc dng lin kt vi cc thanh thp dc thnh h khung, gi vng v tr cc thanh ct thp dc khi thi cng, chu lc ct ngang ct.Trong cu kin thng chu nn lch tm, ng knh ct thp ai trong khung thp buc cn ly khng nh hn 0.25 v khng nh hn 8mm, vi ng knh thanh ct dc ln nht. Trong phm vi nt khung t im cch mp trn n mp di ca sn khong l1 (l1 chiu cao tit din ct, 1/6 chiu cao thng thy ca tng v 45 cm) phi b tr ct ai dy hn; khong cch ca cc ct ai khng ln hn 6 ln ng knh ct thp dc nh nht v cng khng ln hn 100mm. Chn ai d8, u= 100mm.on cn li (l2 gia ct ): khong cch ct ai b rng ct v 12 ln ng knh ct thp dc (ng t trung bnh v yu). Chn ai d8, u = 200mm. Nhn xt: kt qu tnh ton thp ctCng trnh c h vch cng, nn h vch cng tip thu phn ln ni lc nn gi tr thp ra b, a s cc tng l thp cu to, ch c sn thng, tng 9, tng 8 do v tr nh, lc nn nh v gi tr m men tng i ln nn xut hin thp ko tng i ln, cc tng cn li b tng ct chu nn nn ra thp b. Ct C8 ch chu nn l chnh. Trong qu trnh thc hin n, em th gim tit din ct nhiu ln ra hm lng thp hp l. Khi thit k khung nh cao tng c mt s ct, thp cc tng trn cng cao hn cc tng bn di khi s chn thp cc tng trn cng b tr cho cc tng bn di.Bng tnh ton ct thp ct khung trc 2Trng hpTngCtT HpLocLCxCyNM22MxM33MyV2V3AsB tr dy thptt1(%)Thp chntt1chon(%)

mmcmcmkNkN.mkN.mkNkNcm2AsAscm2

(Nmax, MXtu, MYtu)TANG TRETC2COMB1903.35070-6190.6-171.35.24.1-148.659.7Cy1.7120d2276.02.17

(MXmax, MYtu, Ntu)TANG TRETC2COMB13.33.35070-5844.9329.6-9.14.4-145.766.6Cy1.90

(MYmax, MXtu, Ntu)TANG TRETC2COMB83.33.35070-5797.3325.0-10.86.3-143.664.7Cy1.85

(Nmax, MXtu, MYtu)TANG 1C2COMB1904.45070-5539.2-354.96.72.4-150.162.3Cy1.7820d2276.02.17

(MXmax, MYtu, Ntu)TANG 1C2COMB1904.45070-5539.2-354.96.72.4-150.162.3Cy1.78

(MYmax, MXtu, Ntu)TANG 1C2COMB1604.45070-5450.6-332.510.94.0-142.857.2Cy1.63

(Nmax, MXtu, MYtu)TANG 2C2COMB1903.35070-4949.5-349.70.1-0.3-204.242.7Cy1.2220d2276.02.17

(MXmax, MYtu, Ntu)TANG 2C2COMB1903.35070-4949.5-349.70.1-0.3-204.242.7Cy1.22

(MYmax, MXtu, Ntu)TANG 2C2COMB403.35070-4291.8-280.17.73.9-165.815.3Cy0.44

(Nmax, MXtu, MYtu)TANG 3C2COMB1903.35070-4369.8-356.2-2.8-1.7-228.427.7Cy0.7920d2276.02.17

(MXmax, MYtu, Ntu)TANG 3C2COMB193.33.35070-4338.0397.62.7-1.7-228.433.4Cy0.95

(MYmax, MXtu, Ntu)TANG 3C2COMB93.33.35070-4057.9327.211.0-6.2-196.215.8Cy0.45

(Nmax, MXtu, MYtu)TANG 4C2COMB1903.34060-3793.8-261.3-1.0-0.5-169.151.4Cy2.1416d2260.82.53

(MXmax, MYtu, Ntu)TANG 4C2COMB193.33.34060-3772.0296.80.6-0.5-169.157.4Cy2.39

(MYmax, MXtu, Ntu)TANG 4C2COMB503.34060-3268.7-209.8-6.1-3.6-136.328.5Cy1.19

(Nmax, MXtu, MYtu)TANG 5C2COMB19034060-3233.7-319.7-1.3-1.1-190.549.7Cy2.0716d2260.82.53

(MXmax, MYtu, Ntu)TANG 5C2COMB19034060-3233.7-319.7-1.3-1.1-190.549.7Cy2.07

(MYmax, MXtu, Ntu)TANG 5C2COMB93.334060-3007.3255.18.6-4.7-164.530.6Cy1.27


(MXmax, MYtu, Ntu)TANG 6C2COMB193.334060-2653.2352.33.7-2.2-204.752.9Cy2.21

(MYmax, MXtu, Ntu)TANG 6C2COMB9034060-2533.5-270.1-10.0-5.8-179.024.7Cy1.03






(MYmax, MXtu, Ntu)TANG 8C2COMB9034050-1511.0-242.3-9.7-5.6-152.313.1Cy0.66


(MXmax, MYtu, Ntu)TANG 9C2COMB19034050-1043.2-272.2-5.7-3.9-161.222.1Cy1.11


(Nmax, MXtu, MYtu)SAN THUONGC2COMB3034050-514.8-315.4-3.9-0.8-218.636.9Cy1.8416d2260.83.04

(MXmax, MYtu, Ntu)SAN THUONGC2COMB193.334050-484.4413.1-0.6-1.1-223.852.9Cy2.65

(MYmax, MXtu, Ntu)SAN THUONGC2COMB5034050-347.0-241.8-10.2-5.9-153.630.2Cy1.51

(Nmax, MXtu, MYtu)TANG TRETC8COMB303.36080-10396.9-1.319.618.21.1122.2Cx2.5520d28123.22.57

(MXmax, MYtu, Ntu)TANG TRETC8COMB603.36080-8715.257.916.615.525.971.2Cy1.48

(MYmax, MXtu, Ntu)TANG TRETC8COMB83.33.36080-9560.8-4.7-43.021.51.198.9Cx2.06

(Nmax, MXtu, MYtu)TANG 1C8COMB304.46080-9287.02.947.421.90.593.2Cx1.9420d28123.22.57

(MXmax, MYtu, Ntu)TANG 1C8COMB604.46080-7750.472.040.118.525.945.7Cy0.95

(MYmax, MXtu, Ntu)TANG 1C8COMB1604.46080-9107.35.653.524.11.888.4Cx1.84

(Nmax, MXtu, MYtu)TANG 2C8COMB303.36080-8292.3-4.962.737.6-3.562.0Cx1.2920d28123.22.57


(MYmax, MXtu, Ntu)TANG 2C8COMB1603.36080-8128.3-1.572.742.7-1.457.9Cx1.21


(MXmax, MYtu, Ntu)TANG 3C8COMB63.33.36080-6027.6-84.2-73.941.051.04.8Cx0.10

(MYmax, MXtu, Ntu)TANG 3C8COMB163.33.36080-7139.5-1.2-96.954.50.330.1Cx0.63





(MXmax, MYtu, Ntu)TANG 5C8COMB603.35070-4446.585.177.346.750.28.0Cx0.23














(Nmax, MXtu, MYtu)SAN THUONGC8COMB103.34060-960.643.3102.270.435.32.1Cx0.0916d1840.71.70

(MXmax, MYtu, Ntu)SAN THUONGC8COMB103.33.34060-899.6-110.3-129.470.256.516.8Cx0.70

(MYmax, MXtu, Ntu)SAN THUONGC8COMB163.33.34060-886.1-65.3-145.079.929.215.1Cx0.63

(Nmax, MXtu, MYtu)TANG TRETC12COMB303.36080-10393.1-6.917.817.5-4.5122.1Cx2.5420d28123.22.57

(MXmax, MYtu, Ntu)TANG TRETC12COMB703.36080-8710.2-65.115.214.9-28.971.5Cy1.49

(MYmax, MXtu, Ntu)TANG TRETC12COMB83.33.36080-9556.56.9-42.620.9-4.098.8Cx2.06








(MXmax, MYtu, Ntu)TANG 3C12COMB73.33.36080-6023.886.0-74.741.6-51.54.8Cx0.10

(MYmax, MXtu, Ntu)TANG 3C12COMB163.33.36080-7135.93.3-97.154.7-1.130.1Cx0.63





(MXmax, MYtu, Ntu)TANG 5C12COMB703.35070-4443.7-85.078.547.4-50.28.1Cx0.23














(Nmax, MXtu, MYtu)SAN THUONGC12COMB103.34060-958.2-41.5103.271.4-34.12.1Cx0.0916d1840.71.70

(MXmax, MYtu, Ntu)SAN THUONGC12COMB113.33.34060-897.2108.2-132.371.6-55.317.2Cx0.72

(MYmax, MXtu, Ntu)SAN THUONGC12COMB163.33.34060-883.864.0-147.280.9-28.515.4Cx0.64

(Nmax, MXtu, MYtu)TANG TRETC16COMB1803.35070-6189.2166.72.12.7146.759.1Cy1.6920d2276.02.17

(MXmax, MYtu, Ntu)TANG TRETC16COMB13.33.35070-5843.4-328.1-7.63.1143.966.2Cy1.89

(MYmax, MXtu, Ntu)TANG TRETC16COMB83.33.35070-5794.4-323.7-9.34.9142.064.4Cy1.84

(Nmax, MXtu, MYtu)TANG 1C16COMB1804.45070-5538.6353.55.11.6149.462.0Cy1.7720d2276.02.17


(MYmax, MXtu, Ntu)TANG 1C16COMB404.45070-4816.1294.69.53.4126.033.7Cy0.96

(Nmax, MXtu, MYtu)TANG 2C16COMB1803.35070-4949.5348.5-1.7-1.4203.242.6Cy1.2220d2276.02.17

(MXmax, MYtu, Ntu)TANG 2C16COMB1803.35070-4949.5348.5-1.7-1.4203.242.6Cy1.22

(MYmax, MXtu, Ntu)TANG 2C16COMB903.35070-4659.1284.4-8.5-4.7177.226.5Cy0.76


(MXmax, MYtu, Ntu)TANG 3C16COMB183.33.35070-4338.5-396.74.0-2.2228.233.4Cy0.95

(MYmax, MXtu, Ntu)TANG 3C16COMB93.33.35070-4059.4-326.511.8-6.6196.115.8Cy0.45



















(Nmax, MXtu, MYtu)SAN THUONGC16COMB303.34050-514.8316.1-2.9-0.1218.936.8Cy1.8416d2260.83.04

(MXmax, MYtu, Ntu)SAN THUONGC16COMB183.33.34050-484.5-413.7-1.2-0.8224.253.1Cy2.66

(MYmax, MXtu, Ntu)SAN THUONGC16COMB83.33.34050-478.8-380.1-10.03.9200.349.4Cy2.47

Neo v ni chng ct thp Neo ct thp c c quy nh [mc 8.5 TCVN 5574-2012] Cc thanh ct thp dc chu ko v ct thp chu nn cn ko di qua tit din vung gc vi trc dc cu kin m chng c tnh ton vi ton b cng tnh ton, mt khong khng nh hn lan c xc nh theo cng thc:

nhng khng nh hn lan = d. Trong : cng nh gi tr ti thiu lan c xc nh theo [bng 36 TCVN 5574 2005] Neo ct thp Neo ct thp chu ko trong b tng chu koan =0.7; an =11; an =20

Chn lan = 800 mm Neo ct thp chu nn hoc ko trong vng chu nn ca b tng: an =0.5; an =8; an =12

Chn lan = 600 mm Chn chiu di on neo l 30d dng chung cho on neo ct thp.Ni chng ct thp Ni ct thp trong b tng chu ko: an =0.9; an =11; an =20

Chn lan = 35d=900 mm Ni ct thp trong b tng chu nnan =0.6; an =8; an =15

Chn lan = 30d=750mm Chn chiu di on ni chng ct thp l 35d cho vic ni thp.Kim tra n nh tng th cng trnhKim tra cngBng gi tr chuyn v ngang ti nh nhDng t hp ENVE2 kim tra chuyn v nh ca cng trnh.StoryLoadUXUY

STD1EVE2 MAX0.00190.0066

STD1EVE2 MIN-0.0019-0.0066

TANG 9D1EVE2 MAX0.00170.006

TANG 9D1EVE2 MIN-0.0017-0.006

TANG 8D1EVE2 MAX0.00150.0053

TANG 8D1EVE2 MIN-0.0015-0.0053

TANG 7D1EVE2 MAX0.00120.0046

TANG 7D1EVE2 MIN-0.0012-0.0046


TANG 6D1EVE2 MIN-0.001-0.0039

TANG 5D1EVE2 MAX0.00080.0031

TANG 5D1EVE2 MIN-0.0008-0.0031

TANG 4D1EVE2 MAX0.00060.0024

TANG 4D1EVE2 MIN-0.0006-0.0024

TANG 3D1EVE2 MAX0.00040.0017

TANG 3D1EVE2 MIN-0.0004-0.0017


TANG 2D1EVE2 MIN-0.0003-0.001

TANG 1D1EVE2 MAX0.00010.0005

TANG 1D1EVE2 MIN-0.0001-0.0005

TRETD1EVE2 MAX00

TRETD1EVE2 MIN00

Chuyn v ln nht theo phng ngang trn nh cng trnh: 0.0066m.Theo tiu chun xy dng 198 1997(TCVN):Kt cu khung vch: f/H [f/H] = 1/750Ta c: f/H = 0.0066/35.3= 1.87x10-4 < 1/750 = 1.33x10-3Tha iu kin chuyn v.Kim tra chng ltTheo TCXDVN 198 -1997 nh cao tng c t l chiu cao trn chiu rng (H/B):H khung vch (khng chn cp 7): H/B = 35.3/27 = 1.31 5 nn khng cn kim tra n nh chng lt cho cng trnh.Cng trnh m bo n nh tng th.

TNH TON MNG CC P KHUNG TRC 2Gii thiu cng trnhCng trnh gm 10 tng ct 0.00m ca cng ct sn trng vi ct t t nhin, chiu cao cng trnh l 35.3m tnh t ct 0.00m n sn sn thng.Mt bng cng trnh hnh ch nht chiu di 40m, chiu rng 27m. Kt cu khung vch, sn c dm, kt hp vi li cng BTCT. Mt bng khu t khng b gii hn bi cc cng trnh ln cn, nn mt bng cng trnh rt thong, thun li khi thi cng mng kh thun li, khng nh hng n cc cng trnh ln cn nh st l t, ln Cng trnh l nh nhiu tng khung vch chu lc, theo TCXD 205:1998 ln ln nht cho php Sgh= 8cm.iu kin a cht cng trnha tng Theo kt qu kho st th t nn gm cc lp t khc nhau. Do dc cc lp nh, chiu dy kh ng u nn mt cch gn ng c th xem nn t ti mi im ca cng trnh c chiu dy v cu to nh mt ct a cht in hnh (Hnh v). a tng c phn chia theo th t t trn xung di vi cc ch tiu c l nh sau:Ch tiu c l ca tLp tTn tChiu dy (m) m t nhin W%Dung trng t nhin kN/m3T trng ht kN/m3

1t p1.2---

2Bn st nho684.0714.49

3St pha do212918.626.4

4Ct trung cht va111418.126.3

5St pha vng nu trng thi cngRt su17.1620.627.1

LptTn tH s rng t nhin e st BModul bin dng EkN/m2Lc dnh ktCkN/m2Gc ma st trong

1t p-----

2Bn st nho2.271.75-7.60o49

3St pha do0.830.676002317o52

4Ct trung cht va0.66-240004.933o

5St pha vng nu trng thi cng0.5430.011000028.120o28

Mt ct a cht

nh gi iu kin a cht Lp 1: t p lp t ny s c loi b qua khng tnh ton Lp 2: Bn st nho, c su 0m n -6m. Mu xm en, trng thi chy, kh nng chu ti yu khng th lm nn cho cng trnh. Lp 3: St pha do, c su t -6m n 27m. Mu nu, trng thi do, kh nng chu ti va, chiu dy kh ln 11m. Lp 4: Ct trung cht va,c su t -27 n 38m.Mu xm trng, trng thi cht va, kh nng chu ti kh, chiu dy kh ln 12m, c th lm nn cho cng trnh Lp 5: St pha vng nu trng thi cng,rt su. Mu vng nu, trng thi cng, kh nng chu ti ln, bin dng ln nh, chiu dy ln. a cht thy vnMc nc ngm xut hin ti khu vc xy dng cng trnh thay i theo ma tuy nhin trong tnh ton xem mc nc ngm cao trnh mt t t nhin.La chn gii php nn mngCc lp t 4 v 5 c kh nng chu ti kh, chiu dy ln. Lp s 4 v s 5 c su kh thch hp t mi cc p ( t 20 30 m ). Ty chiu di cc s t mi cc vo lp t tng ng v tnh ton c SCT theo iu kin t nn.Ni lc chn ct tng i va phi nn SCT cc p c sn tit din ln c th ph hp s dng cho cng trnh ny. C th xt n cc 30x30, cc 35x35 hoc 40x40 (cm). Chn cc 35x35cm. cc 40x40 rt nng rt kh thi cng p ccC s tnh ton.Cc gi thit tnh ton:Vic tnh ton mng cc i thp da vo cc gi thit ch yu sau:Ti trng ngang hon ton do cc lp t t y i tr ln tip nhn. Sc chu ti ca cc trong mng c xc nh nh i vi cc n ng ring r, khng k n nh hng ca nhm cc.Ti trng ca cng trnh qua i cc ch truyn ln cc cc ch khng trc tip truyn ln phn t nm gia cc cc ti mt tip gip vi i cc. Khi kim tra cng ca nn t v khi xc nh ln ca mng cc th ngi ta coi mng cc nh mt mng khi quy c bao gm cc v cc phn t gia cc cc.Vic tnh ton mng khi quy c ging nh tnh ton mng nng trn nn thin nhin, i cc xem nh tuyt i cng khi tnh ton lc truyn xung cc. Ging mng c tc dng tip thu ni lc ko xut hin khi ln khng u, lm tng cng v cng khng gian ca kt cu. Tuy nhin, khi m hnh tnh khung, ta xem nh ct ngm cng vo mng nn ta b qua s lm vic ca ging.Cc loi ti trng dng tnh tonMng cng trnh c tnh da theo gi tr ni lc nguy him nht truyn xung chn ct, vch. Tnh ton vi 1 trong 3 t hp c:(Nmax, MXtu, MYtu, QXtu, QYtu)(MXmax, MYtu, Ntu, QXtu, QYtu) (MYmax, MXtu, Ntu, QXtu, QYtu) Ty theo tnh hnh s liu ri kim tra vi 2 t hp cn li.Tnh ton Mng Cc khung trc 2Ti trng tnh ton mng Da vo bng t hp ni lc tnh ton chn ct. (Nmax, MXtu, MYtu, QXtu, QYtu) MXtt: m men un quanh trc x. MYtt: m men un quanh trc y. Qxtt: lc ct theo trc x. Qytt: lc ct theo trc y.Ni lc tnh ton y i: lc dc Nz cha k trng lng i). Gi thit i mng cao 1.5m. Ti trng tnh ton ti y i: cha k trng lng i.Ti trng ln mng tnh c t ETABS V9.6 l ti trng tnh ton, mun c t hp cc ti trng tiu chun ln mng ng ra phi lm bng t hp ni lc chn ct khc bng cch nhp ti trng tiu chun tc dng ln cng trnh. Tuy nhin, n gin quy phm cho php dng h s vt ti trung bnh n =1.15. Nh vy, ti trng tiu chun nhn c bng cch ly t hp cc ti trng tnh ton chia cho h s vt ti trung bnh. Ti trng mng M2Ti trng tnh ton chn ct

Trng hp tiT hpNZttM22M33V2V3

MxttMyttQxttQytt

(kN)(kNm)(kNm)(kN)(kN)

(Nmax,MXtu,MYtu,QXtu,QYtu)COMB196190.6171.35.24.1148.6

(Mxmax,Mytu,Ntu,QXtu,QYtu)COMB15844.9329.69.14.4145.7

(Mymax,Mxtu,Ntu,QXtu,QYtu)COMB85797.332510.86.3143.6

Ti trng mng M8Ti trng tnh ton chn ct


MxttMyttQxttQytt





Chn t hp (Nmax,MXtu,MYtu,QXtu,QYtu) tnh ton sau kim tra vi 2 t hp cn li.S b chiu su y i v cc kch thcThit k mt i (trng ct -2.1m so vi mt t t nhin). Mng cc c thit k l mng cc i thp v vy chn su ca i phi tha iu kin lc ngang tc ng y cng trnh phi cn bng vi p lc t tc ng ln i cc. Chn chiu cao i mng l h =1.5 m. Chiu su t y i tnh t ct t t nhin (0.00m) l - 3.6m.hhhkjkj

Chiu su t y i nh nht c thit k vi yu cu cn bng p lc ngang theo gi thit ti ngang do lp t t y i tr ln tip nhn. Dng Qmax = 148.6(kN) ca mng M2 kim tra iu kin cn bng p lc ngang y i theo cng thc thc nghim sau: (s b b rng i l 3m)

Vi Hm: chiu su chn mng t ct thin nhin n y mng =2.1+1.5=3.6m : gc ma st trong ca t t y i tr ln. : dung trng ca t k t y i tr ln mt t. B : cnh ca y i theo phng thng gc vi ti ngang Q.Vt liu v kch thc cc p B tng B25: Rb = 14.5MPa, Rbt = 1.05MPa Thp chu lc AIII (d 10): Rs = Rsc = 365MPa Thp ai nhm AI, Rsw = 175MPa S b chn cc c c tit din vung 35x35(cm).Fc = 0.35x0.35 = 0.123(cm2). S b chn chiu di cc m bo iu kin mi cc nm trong t t 20 n 30m su, v m bo hn 1/3 chiu di cc t trong lp t tt. Chiu di cc c tnh gm: on ct thp neo vo i cc lt = 55cm, on u cc nm trong i lb = 15cm, on cc trong t tnh t di y i lc . Chiu di cc: lc = 27.1(m) gm 3 cc: 2 cc 9m v 1 on 9.1m on cc nm trong i: 0.7(m). on cc nm trong t: 26.4(m). Mi cc nm su - 30(m) cm 3(m) trong lp t 4 (ct ht trung).

S b chn chiu di cc chiu su chn ccSc chu ti ccTheo vt liu lm cc Sc chu ti tnh ton theo vt liu ca cc c tnh theo cng thc sau: Pvl = (RbAb + RsAs) Trong : : H s xt n nh hng ca un dc ph thuc vo mnh ca cc

(vi l0 = l) v = 0.7 l0 = 0.7 x 26.4 = 18.48 m => = 18.48/0.35 = 52.8

Rb: cng chu nn ca b tng B25. Rn = 14.5MPa Ab: din tch mt ct ngang ca cc. Rs: cng tnh ton ca thp AIII. Ra = 365 MPa Ct thp dc 8d18 c Fs = 8 x 2.54=20.32cm2.As: din tch tit din ngang ct dc. As = 20.32 cm2.

Sc chu ti cc theo ch tiu c l ca t nn ph lc A

Ta c: ; chn

; vi h s iu kin lm vic ti mi cc (0.7 cho st v =1 cho ct) h s iu kin lm vic ca t bn hng ly bng (0,9-1)

Thit k mng cc ti su ca mi cc l ct ht trungBng tnh ton thnh phn ma st bn ca cc:LpPhn lp L(m)z(m) su trung bnh (m)Trng thimffsi mf.fsi .li

y mng (-3.6m) -3.6 st IL=1.75

lp 2: Bn st nho12-5.6-4.60.95.610.1

20.4-6-5.80.962.2

lp 3: St pha do32-8-7 st IL=0.60.918.533.3

42-10-90.91934.2

52-12-110.919.234.6

62-14-130.919.635.3

72-16-150.92036.0

82-18-170.92036.0

92-20-190.92036.0

102-22-210.92036.0

112-24-230.92036.0

122-26-250.92036.0

131-27-26.50.920.318.3

lp 4: Ct ht trung142-29-28ct th0.990.2162.4

151-30-29.50.992.383.1

tng:629.3

Sc chu ti ca cc theo ch tiu cng ph lc B Cng thc tng qut: Sc chu ti cc hn : Qu = Qs + Qp

Sc chu ti cho php:

vi v Tnh Qp: sc khng mi cc :Qp = Apqp Ap: din tch tit din mi cc (m2). qp: cng chu ti cc hn ca t mi cc (kN/m2).

Theo TCXD 205:1998 th Trong : c: lc dnh t nn di mi cc (kN/m2). vp : ng sut hu hiu trong t theo phng thng ng ti su mi cc do trng lng bn thn t trng thi t nhin, (kN/m2). Nc , Nq, N: h s SCT, ph thuc vo ma st trong t, hnh dng mi cc. : trng lng th tch t su mi cc (kN/m3). d : b rng tit din cc (m).

Ta c: ; ; Tra bng c: Tnh :Ti su mi cc -30m

Tnh : ma st thn cc: : cc nm trong n lp t Asi: din tch mt bn cc nm trong lp t i (m2). fsi : ma st n v thn cc lp t i (kN/m2).

h s p lc ngang. u: chu vi cc cai: lc dnh gia thn cc v lp t i (kN/m2), vi cc BTCT, cai = 0.7c trong c l lc dnh ca lp t th i. ng sut hu hiu trong t do ti trng bn thn cc lp t gy ra theo phng vung gc vi mt bn cc ca lp t i (kN/m2).

: ng sut hu hiu trong t theo phng thng ng ti su mi cc do trng lng bn thn t trng thi t nhin, (kN/m2), tnh ti im gia ca tng lp t.

: gc ma st gia cc v lp t i, vi cc BTCT ly vi : gc ma st trong ca lp t th i . Ta c:

vi ; Tnh ma st n v

Ti z4=-28.5m lp t 4, L=3m

Ti z3= - 16.5m lp t 3, L=21m

Ti z2= - 4.8m lp t 2, L=2.4m

FSs: h s an ton cho thnh phn ma st bn, FSs = 1.52.0.FSp : h s an ton cho sc chng mi cc, FSp = 2.03.0.La chn sc chu ti cho php cho cc Sc chu ti cc theo c l: 1016 kN Sc chu ti cc theo cng : 1225 kN Sc chu ti cc theo vt liu cc: 2165 kN Ptk min () Chn Ptk = 1000(kN) =100TXc nh s lng ccp lc tnh ton do u cc tc dng ln i:p lc ln nht ca y i m bo lc nn ln nht ln cc t Ptk = 1000kN Mng M2: (di ct C2) S lng cc s b: cc Chn nc = 9 cc.

h s k n lch tm v k n ti trng mng khi qui c (1.2-1.6)Mng M8: (di ct C8) cc Chn 16 ccKim tra b tr ccKim tra lc tc dng ln u cc mng M2Ta kim tra ti trng tc dng ln cc vi tng lc dc tnh ton. mmen theo hai phng (Mx.My) lc ngang theo hai phng (Qx.Qy)Chiu cao i c gi thuyt ban u : H = 1.5 m, chiu su chn mng 3.6m Trng lng bn thn i v t trn i:

Di lc t chn ct v trng tm y i cc ta c ;

Ti trng tnh ton Mng M2 di chn ct C2Ti trng tnh ton chn ct


MxttMyttQxttQytt





Ti trng tc dng ln cc c xc nh theo cng thc :

s lng cc trong i. Ta cc cc:

xi.yi khong cch tnh t trc ca hng cc th i n trc i qua trng tm i

Tnh ton lc tc dng ln u cc M2

Tha. Kim tra cho 2 t hp cn liTrng hp tiT hpNZttM22M33V2V3


(Mymax,Mxtu,Ntu,QXtu,QYtu)COMB85797.3540.420.256.3143.6

Trng hp(Mxmax,Mytu,Ntu,QXtu,QYtu)

Tha. Trng hp: (Mymax,Mxtu,Ntu,QXtu,QYtu)

Hiu ng nhm cc mng M2

vi Trong :n = 3: s hng cc trong nhm m = 3: s cc trong mt hngd = 0.35 m: cnh ccs = 1.1 m: khong cch gia hai tim cc

Ta kim tra khi cc lm vic nhm:

Tha.Kim tra lc tc dng ln u cc mng M8Ta kim tra ti trng tc dng ln cc vi tng lc dc tnh ton. mmen theo hai phng (Mx.My) lc ngang theo hai phng (Qx.Qy)Chiu cao i c gi thuyt ban u : H = 1.5 m, chiu su chn mng 3.6m Trng lng bn thn i v t trn i

Ti trng tnh ton chn ct


MxttMyttQxttQytt





Di lc t chn ct v trng tm y i cc ta c

Ti trng tc dng ln cc c xc nh theo cng thc :

Ta cc cc:


;

Tnh ton lc tc dng ln u cc M8

Tha. Kim tra cho 2 t hp cn li:Trng hp tiT hpNZttM22M33V2V3


(Mymax,Mxtu,Ntu,QXtu,QYtu)COMB89560.86.3575.2521.51.1

Trng hp(Mxmax,Mytu,Ntu,QXtu,QYtu)Di lc t chn ct v trng tm y i cc ta c ;

Trng hp: (Mymax,Mxtu,Ntu,QXtu,QYtu)

Hiu ng nhm cc Mng M8

vi Trong : n = 4: s hng cc trong nhm m = 4: s cc trong mt hng d = 0.35 m: cnh cc s = 1.1 m: khong cch gia hai tim cc

Ta kim tra khi cc lm vic nhm:

Kim tra n nh t nnKim tra mng M2 Xc nh gc truyn lc tb gc ma st trung bnh ca cc lp t

Kch thc khi mng quy c :

Mng khi qui c M2 Ti trng tc dng ln khi mng quy c: Trng lng bn thn i v t trn i:

Trng lng ca t khi mng quy c (khng k trng lng ca cc)

Trng lng bn thn cc:

ng sut trung bnh ti y khi mng quy c :

Trong : m1.m2 h s iu kin lm vic ca nn t v iu kin lm vic ca cng trnh tc ng qua li ca t nn Ktc h s tin cy (Ktc = 1 : c trng tnh ton ly trc tip t th nghim)

Gi thuyt - dung trng lp t t y khi mng qui c tr xung * - dung trng cc lp t t y khi mng qui c tr ln A.B.D h s ph thuc vo gc ma st trong nn tra bng v ni suy :Ta c: =33 A = 1.44515;B = 6.7806;D = 8.8848 = 18.1-10=8.1 (kN/m3)C = 4.9 (kN/m2)Bqu = 6.2(m)

iu kin nn n nh l : => Vy nn y mng khi quy c tha iu kin v n nhKim tra mng M8 Kch thc khi mng quy c :

Mng khi qui c mng M8 Ti trng tc dng ln khi mng quy c : Trng lng bn thn i v t trn i: Trng lng ca t di y i trong khi mng quy c (khng k trng lng ca cc Trng lng bn thn cc:

ng sut trung bnh ti y khi mng quy c :

Trong : m1.m2 h s iu kin lm vic ca nn t v iu kin lm vic ca cng trnh tc ng qua li ca t nn Ktc h s tin cy (Ktc = 1 : c trng tnh ton ly trc tip t th nghim) Gi thuyt - dung trng lp t t y khi mng qui c tr xung * - dung trng cc lp t t y khi mng qui c tr lnA.B.D h s ph thuc vo gc ma st trong nn tra bng v ni suy :Ta c: =33 A = 1.44515;B = 6.7806;D = 8.8848 = 18.1-10=8.1 (kN/m3)C = 4.9 (kN/m2)Bmkqu = 7.3(m)

iu kin nn n nh l :

y nn mng M8 n nhKim tra ln mng ccTnh ln cho mng M2Ta c th tnh ton ln ca nn theo quan nim nn bin dng tuyn tnh. ng sut bn thn ti y mng khi qui cTnh ln ca mng cc trong trng hp ny nh ln ca khi mng quy c trn nn thin nhin.Lp tB dy hing sut bn thn

(m)(kN/m3)

11.2

264.4926.9

2218.6207.5

338.1231.8

p lc gy ln ti tm khi mng quy c

Chia lp t di y mng thnh nhng on nh hi .Chn hi=1 m Xt 1 im thuc trc qua tm mng c su z k t y mng: ng sut do ti trng ngoi gy ra:z= ko.glz=0. vi ko= f() ng sut do trng lng bn thn t gy ra: bt = 231.8+ 8.1z Lp bng v tnh ln cui cng theo cng thc:

Vi gltb: ng sut trung bnh do ti trng ngoi gy ra ti gia lp t ang xt. hi=1m Eoi: m un tng bin dng c ly t th nghim nn ln khng n hng, lp t 4 c Eo= 24000 kN/m2 . i = 0.8: h s khng th nguyn hiu chnh cho s tnh ton n gin ha ly cho mi trng hp.Tnh ln mng M2BNG TNH LN

su (m)Z (m)Z/Bk0gaylun(kN/m2)banthan (kN/m2)gayluntb(kN/m2) ln (cm)

-3000.001.00138.0231.8

135.80.45

-31-10.160.97133.6239.9

126.40.42

-32-20.320.86119.2248.0

109.60.37

-33-30.480.7299.9256.1

89.30.30

-34-40.650.5778.7264.2

70.00.23

-35-50.810.4461.3272.3

55.30.18

-36-60.970.3649.2280.4

Tng1.95

Khi ta c th ngng tnh ln.

Ti -36m

=> Tha mn v iu kin ln.Tnh ln cho mng M8 p lc gy ln ti tm khi mng quy c .

Tnh ln mng M8BNG TNH LN

su (m)Z (m)Z/Bk0gaylun(kN/m2)banthan (kN/m2)gayluntb(kN/m2) ln (cm)

-3000.001.00169.0231.8

166.60.56

-31-10.140.97164.3239.9

158.50.53

-32-20.270.90152.8248.0

143.20.48

-33-30.410.79133.6256.1

122.40.41

-34-40.550.66111.1264.2

101.70.34

-35-50.680.5592.3272.3

83.20.28

-36-60.820.4474.2280.4

67.70.23

-37-70.960.3661.2288.5

55.90.19

-38-81.100.3050.7296.6

Tng3.00

Kim tra iu kin ln lch gia cc mng Mng trc M2(C2) v mng M8(C8): LAB = 9 m.

=> Vy iu kin bin dng ca nn c tha mn.Tnh ton v cu to i cc:Kim tra iu kin chc thng mng M2 Tc nhn gy chc thng i cc: phn lc do cc cc nm ngoi y thp chc thng. Nu tt c cc cc trong i u b bao trm hon ton bi y thp chc thng th khng cn kim tra. Thp chc thng: xut pht t mp ct v m rng v 4 pha 1 gc 450. Kch thc y thp chc thng : Bxienthung = bc + 2.h2.Lxienthung = lc + 2.h2. Vi: bc, lc: chiu rng v chiu cao ct, h2 l on chiu cao i t mt trn i n u cc ngm vo i h2 = 1.5 0.15 = 1.35 (m). Tit din ct: 50x70(cm). Kch thc y thp chc thng:Bxienthung = 500 + 2x1350 = 3200(mm) v Lxienthung = 700 + 2x1350 = 3400(mm).

Kim tra xin thng Mng M2

V thp m thng th y thp nm trm ra ngoi trc cc cc. Nh vy i khng b m thng.Kim tra iu kin chc thng mng M8

Kim tra xin thng mng M8

Cc nm ngoi y thp chc thng ly phn lc u cc tnh lc gy chc thng, cc cc nm 1 phn ngoi y thp chc thng th ta tnh din tch nm ngoi vi phn lc ca n:

phn lc rng ca cc nm ngoi y thp xin thng

Trong :

s lng cc trong i.Ta cc cc:


Tng phn lc gy chc thng bng tng phn lc cc u cc nm ngoi phm vi y thp m thng.

Mng M8 khng b xin thng.Tnh ton thp cho i mngTnh ton thp cho i mng M2

S tnh i mng M2 Xem i cc lm vic nh 1 cng son ngm ti mp ct. M men ti ngm do phn lc cc u cc gy ra:

ri cnh tay n, khong cch t mp ct n trng tm cc th i. : phn lc u cc th i. Din tch ct thp tnh theo cng thc:

h o: chiu cao lm vic ca i (h o = 150 15 = 135cm) Rs: cng tnh ton ca ct thp. b2 = 0,9: h s iu kin lm vic ca b tng khng k n s pht trin cng theo thi gian. Momen ti mt ct ngm A-A

Trong :

Ta cc cc:


Chn thp d16 c as = 201mm2

S thanh thp => Chn n =19 thanh

Khong cch gia cc thanh => Chn s = 160mm Vy chn d16a160 b tr thp



Khong cch gia cc thanh => Chn s = 150mm Vy chn d16a150 b tr thp Tnh ton thp cho i mng M8

S tnh ton di mng M8



Khong cch gia cc thanh => Chn s = 150mm Vy chn d20s150 b tr thp.



Khong cch gia cc thanh => Chn s = 130mm Vy chn d20s130 b tr thp.Kim tra cc trong qu trnh vn chuyn v cu lp

Ti trng phn b u tc dng ln cc khi vn chuyn. lp dng chnh l ti trng bn thn ca cc:

Cng cc khi vn chuyn Moment un ln nht ti im gia cc v mc cu:

Chn b dy lp Btng bo v ct thp cc l 3.0 cm

Cng cc khi lp dng:

Ta c:

Nh vy, cc m bo khng b ph hoi trong qu trnh vn chuyn, cu lp. Kim tra lc cu. mc cu: Chn thp mc cu l AIII. 1d18 c As = 2.545 cm2. Kh nng chu lc ko ca thp mc cu:

Ti trng cc tc dng vo mc cu: Bo co Thit k cng trnhSVTH : Hunh Ngc LutTa thy kh nng chu lc ca thp mc cu ln hn ti trng tc dng vo mc cu.Chng 6 : Tnh ton mng cc p khung trc 2 trang 132TNH TON MNG CC KHOAN NHI a chtCh tiu c l ca tLp tTn tChiu dy (m) m t nhin W(%)Dung trng t nhin (kN/m3)T trng ht (kN/m3)

1t p1.2---

2Bn st nho684.0714.49

3St pha do212918.626.4

4Ct trung cht va111418.126.3

5St pha vng nu trng thi cngRt su17.1620.627.1

Lp tTn tH s rng t nhin e st BModul bin dng E(kN/m2)Lc dnh kt C(kN/m2)Gc ma st trong()

1t p-----

2Bn st nho2.271.75-7.60o49

3St pha do0.830.676002317o52

4Ct trung cht va0.66-240004.933o

5St pha vng nu trng thi cng0.5430.011000028.120o28


Chng 7 : Tnh ton mng cc khoan nhi trang 165

MT CT TR A CHT

Ti trngTi trng mng M2Ti trng tnh ton chn ct


MxttMyttQxttQytt





Ti trng mng M8Ti trng tnh ton chn ct


MxttMyttQxttQytt





Chn t hp (Nmax,MXtu,MYtu,QXtu,QYtu) tnh ton sau kim tra 2 t hp cn li.Chn loi cc v chiu su mi cc Vt liu : Btng cc v i B25: Rb= 145 KG/cm2, Rbt = 10.5 KG/cm2. Ct thp nhm AIII, Rs= 3650 KG/cm2). Cc : Theo iu kin ia cht, ta t mi cc ti lp t 5 st trng thi cng c su t -41m. Chiu di cc ( t y i tr xung): 37.4 (m). Cc c tit din : D = 800mm => Din tch ct thp dc trong cc : 12d18 Fa = 30.5 cm2. i cc : S b chn i cc cao h = 1.5m ging mng cc p Cao mt i so vi mc chun : -2.1 (m). Cao y i : -3.6 (m). Mi cc t lp t th 4, cc ngm vo lp th t 5 on : 3(m).

Tnh ton sc chu ti ca ccTheo cng vt liuDo cc nhi c thi cng b tng ti ch vo cc h khoan, h o sn sau khi t lng ct thp cn thit vo h khoan. Vic kim sot iu kin cht lng b tng kh khn, nn sc chu ti ca cc nhi khng th tnh nh cc ch to sn m c khuynh hng gim i.Pvl = Ru.A + Ran.Fa (tham kho TCXD 195-1997). Ru: cng tnh ton ca b tng cc nhi. Ru = R/4.5 Khi b tng di nc hoc dung dch st + khng ln hn 6 Mpa. R : mc thit k ca b tng(kG/cm2).

Chn A: Din tch tit din ngang ca cc: A = 5024cm2.

Fa: Din tch ct thp dc trong cc:1218 Fa = 30.5cm2. Ra :cng tnh ton ca thp. Dng thp AIII:

d < 28 nhng khng ln hn 220Mpa.

Chn

Sc chu ti cc theo ch tiu c l t nn ph lc A

Ta c: ; chn

; Vi: h s iu kin lm vic ti mi cc (0.7 cho st v =1 cho ct) qp: Cng chu ti ca t ti mi cc (kN/m2) Tra bng: Ap: din tch ngang ca cc. Ap = 0.5024(m2) U: Chu vi thn cc; h s iu kin lm vic ca t bn hng cc khoan nhi. n gin chn =0.9 fsi: Cng tiu chun ca ma st thnh lp t th i vi b mt xung quanh cc, c tnh ton bng cch tra Bng A.2, TCXD 205:1998. Chia t nn thnh cc lp t ng nht nh hnh v (Chiu dy mi lp ly 2m). y Zi v H ly t ct thin nhin. li : Chiu dy lp t th i tip xc vi cc Thit k mng cc ti su ca mi cc l -41m

Bng tnh ton thnh phn ma st bn ca cc:LpPhn lp L(m)z(m) su trung bnh (m)Trng thimffsi mf.fsi .li

y mng (-3.6m) -3.6 st IL=1.75

lp 2: Bn st nho12-5.6-4.60.95.610.1

20.4-6-5.80.96.02.2

lp 3: St pha do32-8-7 st IL=0.60.918.533.3

42-10-90.919.034.2

52-12-110.919.234.6

62-14-130.919.635.3

72-16-150.920.036.0

82-18-170.920.036.0

92-20-190.920.036.0

102-22-210.920.036.0

112-24-230.920.036.0

122-26-250.920.036.0

131-27-26.50.920.318.3

lp 4: Ct ht trung142-29-28ct th(tra bng cng thm 30%)0.9117.3211.1

152-31-300.9120.9217.6

162-33-320.9124.5224.2

172-35-340.9128.2230.7

182-37-360.9130.0234.0

191-38-37.50.9130.0117.0

lp 5: St cng202-40-39St IL=0.010.9100.0180.0

211-41-40.50.9100.090.0

25tng:1888.4

0. Sc chu ti ca cc theo ch tiu cng ph lc B Cng thc tng qut: Sc chu ti cc hn : Qu = Qs + Qp

Sc chu ti cho php:

Ta c: vi v Tnh Qp: sc khng mi cc Qp = Apqp Trong : Ap: din tch tit din mi cc (m2). qp: cng chu ti cc hn ca t mi cc (kN/m2). Theo TCXD 205:1998 th Trong : c: lc dnh t nn di mi cc (kN/m2). vp : ng sut hu hiu trong t theo phng thng ng ti su mi cc do trng lng bn thn t trng thi t nhin, (kN/m2). Nc , Nq, N: h s SCT, ph thuc vo ma st trong ca t, hnh dng mi cc, : trng lng th tch t su mi cc (kN/m3). d : b rng tit din cc (m).

Ta c: ; ;

Tra bng c: v ni suy Tnh :Ti su mi cc -41m

Ma st n v cc Tnh : ma st thn cc

: cc nm trong n lp t Asi: din tch mt bn cc nm trong lp t i (m2). fsi : ma st n v thn cc lp t i (kN/m2).

Trong : h s p lc ngang. u: chu vi cc cai: lc dnh gia thn cc v lp t i (kN/m2), vi cc BTCT, cai = 0.7c trong c l lc dnh ca lp t th i. ng sut hu hiu trong t do ti trng bn thn cc lp t trng thi t nhin gy ra theo phng vung gc vi mt bn cc ca lp t i (kN/m2). : ng sut hu hiu trong t theo phng thng ng ti su mi cc do trng lng bn thn t trng thi t nhin tn

do an-luat-26-01-hoan-thanh-v3

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