GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN PHN IKIN TRCSVTH:NGUYN XUN HNG MSSV:X070757 TRANG1GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN CHNG I:TNG QUAN V KIN TRC CNG TRNH--------------1.MC CH XY DNG CNG TRNHHin nay, TP.HCM l mt trong hai trung tm thng mi ln nht c nc vi tc pht trin v mc th ha ngy cng tng. iu ny khin cho mt dn s tng cao v ko theo l nhu cu v nh cng ngy mt tng v tr thnh mt nhu cu cp thit.Do vic xy dng nh cao tng theo kiu chung c l gii php tt nht p ng nhu cu nh cho ngi dn.c bit l thnh phn dn nhp c t cc tnh v thnh ph lp nghip. V vy,Chung c ng Thunra i l mt bc i ng n nhm gii quyt phn no vn trn. 2.C IM KHU VC XY DNG2.1.a im xy dngCng trnh c xy dng ti khu vc nng ng nhiu tim nng v ang trn pht trin ca TP.HCM hin nay l Qun Bnh thnh.2.2.c im kh hu khu vc xy dngThnh ph H Ch Minh nm trong khu vc nhit i gi ma nng m vi cc c trng ca vng kh hu min ng Nam B, chia thnh 2 ma r rt :-Ma ma t thng 5 n thng 10.-Ma kh t u thng 11 v kt thc vo thng 4 nm sau.Cc yu t kh tng :-Nhit trung bnh nm : 260C-Nhit thp nht : 180C-Nhit cao nht : 360C-Lng ma trung bnh : 1000-1800 mm/nm- m tng i thp nht vo ma kh : 70-80 %- m tng i cao nht vo ma ma : 80-90%-S gi nng trung bnh kh cao, ngay trong ma ma cng c trn 4 gi/ngy, vo ma kh l trn 8 gi/ngy.Hng gi : -Hng gi ch o l ng Nam v Ty Nam vi vn tc trung bnh 2.5 m/s, thi mnh nht vo ma ma. Thnh ph H Ch Minh nm trong khu vc t chu nh hung ca gi bo, chu nh hng ca gi ma v p thp nhit i.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG2GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN 3.C IM KIN TRC CNG TRNH3.1.Quy m cng trnh-Chung c ng Thun gm 14 tng : 1 tng hmv 13 tng ni vi 1 tng di phc v cho nhu cu gii tr cn cc tng trn cng cc cn h phc v nhu cu .-Cng trnh c din tch tng mt bng (20x44.4) m2, bc nhpnht 9m, chiu cao tng hm 3.6 m, tng trt cao 5.2m, cc tng cn li l 3.6m. -Ct 0.00 m c chn t ti mt sn tng trt, mt t t nhin ti ct -1.0 m, mt sn tng hm ti ct -3. 6.Chiu cao cng tnh l 52m tnh t ct 0.00 m.3.2.Mt bng v phn khu chc nng-Tng hm : thang my b tr gia, ch u xe t, xe my xung quanh. Cc h thng k thut nh b cha nc sinh hot, trm bm, trm x l nc thi c b tr hp l gim ti thiu chiu di ng dn. Tng hm c b tr thm cc b phn k thut v in nh trm cao th, h th, phng qut gi.-Tng trt :dng lm siu th v cc dch v cng cng : nh tr, dch v chm sc sc kho, th dc thm m phc v nhu cu mua bn, vui chi, gii trcho cc h gia nh cng nh nhu cu chung ca khu vc.-Tng 2 n tng 13 : b tr cc cn h phc v nhu cu .-Tng mi : b tr cc phng k thut v 2 b nc dng cho sinh hot v cha chy. Nhn chung 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.3.3.Mt ng-Mt ng b tr i xng vi s lp li ca cc ca ln v phn chia thnh cc khi th hin r rng s tch bit gia cc khu nh .3.4.Gii php giao thng ni b-Giao thng ngang l h thng hnh langH thng giao thng ng l thang b v thang my, bao gm 2 thang b v 2 thang my b tr. H thng cu thang b c b tr khu vc bn ca cng trnh dng ch yu phng trng hp khn cp, cn ch yu l i li bng thang my cc cn h b tr xung quanh li phn cch bi hnh lang nn khong cch i li l ngn nht, rt tin li, hp l v bo m thng thong.4.CC GII PHP K THUT CNG TRNH4.1.H thng in-H thng tip nhn in t h thng in chung ca thnh ph vo cng trnh thng qua phng my in. T y in s c dn i khp ni trong cng trnh thng qua mng li in ni b. Ngoi ra khi b s c mt in c th dng ngay my pht din d phng t tng hm pht.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG3GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN 4.2.H thng nc-Ngun nc c ly t h thng cp nc ca thnh ph v dn vo h nc tng hm ri qua h thng bm nc t ng bm ln b nc tng mi nhm p ng nhu cu nc cho sinh hot cc tng.-Cc ng ng ng qua cc tng u c bc trong hp ghen. H thng cp nc i ngm trong cc hp k thut. Cc ng ng cu ho chnh c b tr mi tng.-Nc thi t cc tng c tp trung v khu x l v b t hoi t tng hm sau c y vo h thng thot nc chung ca thnh ph.4.3.H thng thng gi v chiu sng-Ton b to nh c chiu sng v thng gi t nhin thng qua h thng ban cng v ca s t cc mt ca cng trnh.-Ngoi ra, ti cc li i ln xung cu thang, hnh lang v nht l tng hm u c lp t thm n chiu sng. Trong cc cn h u c lp t h thng iu ho khng kh.4.4.Phng chy v thot him-Ti mi tng u c t h thng bo chy, cc thit b cha chy. Dc theo cc cu thang b u c h thng ng vi rng cu ho. -Cc tng lu u c hai cu thang b m bo thot ngi khi c s c v chy n.4.5.H thng chng st-Chn s dng h thng thu st ch ng qu cu Dynasphire c thit lp tng mi v h thng dy ni t bng ng c thit k ti thiu ho nguy c b st nh.4.6.H thng thot rc-Rc thi mi tng c vo gen rc c b tr tng hm v c b phn a rc ra ngoi. Gen rc c thit k kn o, k cng trnh lm bc mi gy nhim mi trng.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG4GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN PHN II:KT CUSVTH:NGUYN XUN HNG MSSV:X070757 TRANG5GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN CHNG 1 : TNG QUAN V KT CU CNG TRNH---------------1.LA CHN GII PHP KT CU CNG TRNH:1.1.H KT CU CHU LC CHNH:Nu cn c vo s lm vic th kt cu nh cao tng c th phn loi nh sau:-Cc h kt cu c bn: Kt cu khung, kt cu tng chu lc, kt cu li cng v kt cu ng.-Cc h kt cu hn hp: Kt cu khung-ging , kt cu khung-vch , kt cu ng li v kt cu ng t hp.-Cc h kt cu c bit: H kt cu c tng cng, h kt cu c dm truyn,kt cu c h ging lin tng v kt cu c khung ghp-Mi loi kt cu trn u c nhng u nhc im ring ty thuc vo nhu cu v kh nng thi cng thc t ca tng cng trnh.Trong : -Hktcuchungging(khungvvchcng)ctorabngskthp h thng khung v h thng vch cng. H thng vch cng thng c to ra ti khu vc cu thang b, cu thang my, khu v sinh chung hoc cc trng bin, l cc khu vc c tng lin tc nhiu tng. H thng khung c b tr ti cc khu vc cn li ca ngi nh. Hai h thng khung v vch c lin kt vi nhau qua h kt cu sn. Trong trng hp ny h sn lin khi c ngha rt ln. -Thng tronghthngktcunyhthngvchngvaitrchyuchu ti trng ngang, h khung ch yu c thit k chu ti trng thng ng. S phn r chc nng ny to iu kin ti u ho cc cu kin, gim bt kch thc ct v dm, p ng c yu cu ca kin trc.-H kt cu khung - ging t ra l h kt cu ti u cho nhiu loi cng trnh cao tng. Loi kt cu ny s dng hiu qu cho cc ngi nh n 40 tng. Nu cng trnh c thit k cho vng c ng t cp 8 th chiu cao ti a cho loi kt cu ny l 30 tng, cho vng ng t cp 9 l 20 tng. V vy, h kt cu khung-vch cng c chn lm h thng chu lc chnh ca cng trnh trong n ny.1.2.H KT CU SN :-Trong cng trnh h sn c nh hng rt ln ti slm vic khng gian ca kt cu. Vic la chn phng n sn hp l l iu rt quan trng. Do vy,cn phi c s phn tch ng la chn ra phng n ph hp vi kt cu ca cng trnh.-Ta xt cc phng n sn sau:1.2.1.H SN SN-Cu to bao gm h dm v bn sn.-u im:+Tnh ton n ginSVTH:NGUYN XUN HNG MSSV:X070757 TRANG6GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN +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.-Nhc im: +Chiu cao dm v vng ca bn sn rt ln khi vt khu ln, dn n chiu cao tng ca cng trnh ln nn gy bt li cho kt cu cng trnh khi chu ti trng ngang v khng tit kim chi ph vt liu.+Khng tit kim khng gian s dng.1.2.2.H SN C-Cu to gm h dm vung gc vi nhau theo hai phng, chia bn sn thnh cc bn k bn cnh c nhp b, theo yu cu cu to khong cch gia cc dm khng qu 2m.-u im: +Trnh c c qu nhiu ct bn trong nn tit kim c khng gian s dng v c kin trc p,thch hp vi cc cng trnh yu cu thm m cao v khng gian s dng ln nh hi trng, cu lc b...-Nhc im:+Khng tit kim chi ph, thi cng phc tp. +Khi mt bng sn qu rng cn phi b tr thm cc dm chnh. V vy, n cng khng trnh c nhng hn ch do chiu cao dm chnh phi ln gim vng.1.2.3.SN KHNG DM-Cu to gm cc bn k trc tip ln ct. -u im:+Chiu cao kt cu nh nn gim c chiu cao cng trnh. +D phn chia khng gian s dngcng nh b tr cc h thng k thut.-Nhc im:+Trong phng n ny cc ct khng c lin kt vi nhau to thnh khung do cng nh hn nhiu so vi phng n sn dm, do vy kh nng chu lc theo phng ngang phng n ny km hn phng n sn dm, chnh v vy ti trng ngang hu ht do vch chu v ti trng ng do ct chu. +Sn phi c chiu dy ln m bo kh nng chu un v chng chc thng do dn n tng khi lng sn.1.2.4.SN KHNG DM NG LC TRC-u im: Ngoi cc c im chung ca phng n sn khng dm th phng n sn khng dm ng lc trc s khc phc c mt s nhc im ca phng n sn khng dm:+Gim chiu dy sn khin gim c khi lng sn dn ti gim ti trng ngang tc dng vo cng trnh cng nh gim ti trng ng truyn xung mng.+Tng cng ca sn ln, khin cho tho mn v yu cu s dng bnh thng.+S chu lc tr nn ti u hn do ct thp ng lc trc c t ph hp vi biu m men do tnh ti gy ra, khin cho tit kim c ct thp.-Nhc im:+Thit b thi cng phc tp hn, yu cu vic ch to v t ct thp phi chnh xc do yu cu tay ngh thi cng phi cao hn.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG7GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN +Gi thnh thit b cn cao, cc thit b cn him do trong nc cha sn xut c.1.2.5.KT LUN-Qua phn tch cc u nhc im ca tng phng n ng thixem xt vi cc t im kin trc cng trnh, ta c nhn xt nh sau :+Phng n sn sn gip thun li cho qu trnh tnh ton v thi cng do ang l gii php c s dng ph bin nc ta hin nay.+Trong khi , phng n sn khng dm d c nhng u im nht nh nhng vi cng trnh c nhp ln (8,4 m) th phng n ny khng mang li hiu qu kinh t cao do chiu dy bn sn ln.+Cn 2 phng n kia th li gp kh khn trong vn thi cng v chi ph tn km.-V vy phng n sn sn l phng n c chn trong n ny.1.VT LIU S DNG :2.1. BTNG :-B tng cho cc kt cu bn trn nh ct, vch ,dm, sn, cu thang, b nc v b tng cho cc dng b tng B25 vi cc ch tiu nh sau :+Khi lng ring : = 2.5 T/m3.+Cng chu nn tnh ton : Rb = 145 kG/cm2.+Cng chu ko tnh ton : Rbt = 10.5 kG/cm2.+Mdul n hi : Eb = 3 x 105 kG/cm2.2.2 CT THP :Ct thp ty theo cu kin s dng 1 trong 3 loi thp sau :-Ct thp loi AI vi cc ch tiu :+Cng tnh ton : Rs = Rs = 2250 kG/cm2.+Cng tnh ton khi dng lm ct ngang : Rsw = 1750 kG/cm2.+Mdul n hi : Ea = 2.1 x 106 kG/cm2.-Ct thp loi AII vi cc ch tiu :+Cng tnh ton : Rs = Rs = 2800 kG/cm2.+Cng tnh ton khi dng lm ct ngang : Rsw = 2200 kG/cm2.+Mdul n hi : Ea = 2.1 x 106 kG/cm2.-Ct thp loi AIII vi cc ch tiu :+Cng tnh ton : Rs = Rs = 3650 kG/cm2.+Cng tnh ton khi dng lm ct ngang : Rsw = 2750 kG/cm2.+Mdul n hi : Ea = 2.1 x 106 kG/cm2.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG8GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN CHNG 2 : TNH TON SN TNG IN HNH---------------1. S KT CU1.1 MT BNG DM SN TNG IN HNH :SN 5SN 6SN 6SN 4 SN 4SN 5SN 6SN 3SN 7 SN 7SN 1SN 8 SN 8SN 1 SN 1SN 1 SN 1 SN 1SN 1 SN 1SN 1 SN 1 SN 1 SN 1SN 1 SN 1 SN 1 SN 1SN 1SN 1 SN 2 SN 2SN 2 SN 2SN 5SN 6SN 6SN 5SN 6SN 7 SN 7SN 1 SN 1 SN 1SN 1 SN 1 SN 1SN 1 SN 1SN 1 SN 1 SN 1 SN 1SN 1 SN 1 SN 1 SN 1SN 1SN 1V1 V2V3V6 V5 V41.2 KCH THC TIT DINTheo sch "Kt cu btng ct thp - Phn cu kin c bn", ta chn kch thc nh sau :1.2.1 Chn chiu dy bn sn :- Chiu dy bn sn c chn s b theo cng thc : Chn hb = 8 cm1.2.2 Chn kch thc dm chnh :1 1 1 1900 112.5 758 12 8 12dch l cm _ _ , , Chn hdc = 70 cm( ) ( )0, 3 0, 5 0, 3 0, 5 80 24 40dc dcb h cm SVTH:NGUYN XUN HNG MSSV:X070757 TRANG91 1 1 1400 8 1040 45 40 45bh l cm _ _ , ,GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN Chn bdc = 30 cm Chn tit din cho tt c cc dm chnh l :+ hdc = 70 cmTr nhpD-C c+ hdc = 50 cm + bdc = 30 cm1.2.3Chn kch thc dm ph:1 1 1 1900 45 7512 20 12 20dph l cm _ _ , , Chn hdp = 50 cm( ) ( )0, 3 0, 5 0, 3 0, 5 50 15 25 dp dpb h cm Chn bdp = 30 cm Chn tit din cho tt c cc dm ph l :+ hdp = 50 cm1.2.4Chn kch thc mi : - Chn mi c kch thc :+ hdm = 40 cm + bdm = 20 cm2. TI TRNG- Cc s liu v ti trng ly theo TCVN 2737 1995 : Ti trng v tc ng tiu chun thit k.- H s vt ti ly theo bng 1, trang 10 TCVN 2737 - 1995.- Trng lng ring ca cc thnh phn cu to sn ly theo S tay thc hnh kt cu cng trnh ( TS. V Mnh Hng )2.1 TNH TI :2.1.1 Tnh ti do cc lp cu to sn : Sn khu , hnh lang, ban cng :SVTH:NGUYN XUN HNG MSSV:X070757 TRANG10GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN BAN BTCT BETONG B25 D=80mmMASTIC, SN NC MAU TRANGLP VA TOM75 D =15mmLP VA LOT XM M75 D =20mmLAT GACH MEN D =10mmVt liuChiu dy (m) (kG/m3)HSVT ngtc (kG/m2)gtt (kG/m2)Lp gch men 0.01 2000 1.1 20 22Lp va lt 0.02 1800 1.3 36 46.8Bn BTCT 0.08 2500 1.1 200 220Lp va trt 0.015 1800 1.3 27 35.1ng ng, thit b 0 60Tng cng 283 383.9 Sn khu v sinh :Vt liuChiu dy (m) (kG/m3)HSVT ngtc (kG/m2)gtt (kG/m2)Lp gch Ceramic 0.01 2000 1.1 20 22Lp va lt 0.02 1800 1.3 36 46.8Lp chng thm 0.03 2200 1.2 66 79.2Bn BTCT 0.08 2500 1.1 200 220Lp va trt 0.015 1800 1.3 27 35.1ng ng, thit b 70Tng cng 349 473.1SVTH:NGUYN XUN HNG MSSV:X070757 TRANG11GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN Khi tnh ton sn tng in hnh, n gin ta ly gi tr tnh ti do cc lp cu to sn l gi tr trung bnh ca sn khu v sn khu v sinh :2383.9 473.1428.5 /2ttctg kG m+ 2283 349316 /2t cctg kG m+ 2.1.2 Tnh ti do ti tng phn b trn sn :Thng thng di cc tng thng c kt cu dm nhng tng tnh linh hot trong vic b tr tng ngn nn mt s tng ny khng c dm bn di. Do khi xc nh ti trng tc dng ln sn, ta phi k thm trng lng tng ngn, ti ny c quy v phn b u trn ton b sn. c xc nh theo cng thc : ( )2/ tcT t t ttB H lg daN mSTrong BT : b rng tng (m)Ht : Chiu cao tng (m)lt: chiu di tng(m)t : trng lng ring ca tng xy (daN/m3)S : din tch sn c tng(m2)N : h s vt ti Bng tnh ti tng trn cc : snBt (m)Ht (m)Lt (m)T (kG/m3)S (m2)gttc (kG/m2)ngttt (kG/m2)S1(8) 0.10 3.00 6.90 1800.00 12.21 305.16 1.30 396.71S2(3) 0.10 3.00 5.50 1800.00 16.10 184.36 1.30 239.67S4 0.10 3.00 0.70 1800.00 3.05 124.14 1.30 161.38S6 0.10 3.00 0.70 1800.00 2.73 138.46 1.30 180.002.1.3 Tng tnh ti phn b u trn cc sn : Cng thc tnh :gstt = gttt + gcttgcttt(kG/m2) gttt gstt SVTH:NGUYN XUN HNG MSSV:X070757 TRANG12GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN SN (kG/m2) (kG/m2)S1 428.5 396.71 825.21S2 428.5 239.67 668.17S4 428.5 161.38 589.88S6 428.5 180 608.5S5 428.5 0 428.5S7 428.5 0 428.5S8 428.5 0 428.5S3 428.5 0 428.52.2 HOT TIGi tr ca hot ti c chn da theo chc nng s dng ca cc loi phng. H s tin cy n, i vi ti trng phn b u xc nh theo iu 4.3.3 trang 6- TCVN 2737 -1995:Chc nng Phngptc(daN/m2)n pttsn(daN/m2)Hnh lang 300 1.2 360P. Khch 150 1.3 195WC 150 1.3 195Phng ng 150 1.3 195Phng n 150 1.3 195Snh 300 1.2 360Cu thang 300 1.2 360Ban cng 400 1.2 4802.3 TNG TI TRNG TRN CC SN sn gStt (kG/m2)pStt (kG/m2)qStt (kG/m2)L1 (m) L2 (m) BN K 4 CNHS1 825.21 195.00 1020.21 3.30 3.70S2 668.17 195.00 863.17 3.70 4.50S7 428.50 360.00 788.50 3.30 3.70S8 428.50 360.00 788.50 3.70 4.50 BN DMS3 428.50 360.00 908.50 1.48SVTH:NGUYN XUN HNG MSSV:X070757 TRANG13GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN S4 589.88 480.00 1069.88 0.70S5 428.50 480.00 908.50 0.70S6 608.50 480.00 1088.50 0.703. TNH NI LCQuan im tnh ton:tnh ton bng cch tch ra tng bn ring ( bn n) tnh.3.1 BN K 4 CNH :-Khi = 12LL2 th bn c xem l bn k, lc ny bn lm vic theo c hai phng L2 (cnh di ) v L1(cnh ngn ) ca bn.-Ta thy cc bn u c hd min=400 mm > 3.hb=300 mm nn cc lin kt gia bn v dm u c xem l ngm, ngha l cc u l bn s 91 I 1 Ii 2 2 II II I12 I Phng php tnh :-Ct bn theo mi phng vi b rng b = 1m, gii vi ti phn b u tm moment nhp v gi. + Moment dng ln nht gia bn (p dng cng thc tnh tnh Mment ca bn lin tc) :Mmen nhp theo phng cnh ngn L1: M1 = 1qSttlt1lt2 (kG.m/m)Mmen nhp theo phng cnh di L2 :M2 = 2qSttlt1lt2 (kG.m/m)+Moment m ln nht gi:Mmen gi theo phng cnh ngn L1: MA1=MB1= 1qSttlt1lt2(kG.m/m) Mmen nhp theo phng cnh di L2 :MA2 =MB2= 2qSttlt1lt2 (kG.m/m)SVTH:NGUYN XUN HNG MSSV:X070757 TRANG14GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN Trong :lt1,lt2: nhp tnh ton cu bng l khong cch gia cc trc gi ta. Cc h s:1, 2, 1,2 cc h s ph thuc vo t l21ltlt tra bng 1-19 trang 32 sch S tay kt cu cng trnh ca thyV Mnh Hng Cc bn tnh :Bng tra cc h s sn ltL1 (m) lt2 (m) lt2/lt11212S1 3.3 3.7 1.12 0.0197 0.0156 0.0455 0.0362S2 3.7 4.2 1.1350 0.0198 0.0153 0.0458 0.0356Bng ni lc cc bn k 4 cnh sn qStt (kG/m) M1 (+) kG.mM2 (+) kG.mMI (-) kG.mMII (-) kG.mNhp ngnNhp diGi ngnGi diS1 1020.21245.40 194.33 566.78 450.93S2 863.17265.59 205.23 614.35 477.53S7 788.5189.66 150.19 438.06 348.52S8 788.5242.62 187.48 561.20 436.223.2. BN DM :-Khi = 21ltlt> 2 th bn c xem l bn dm, lc ny bn lm vic theo mt phng (phng cnh ngn).-Ta thy cc bn u c hd min=400 mm > 3.hb=300 mm nn cc lin kt gia bn v dm u c xem l ngm b=1mqL1L2Phng php tnh :Ct bn theo cnh ngn v b rng b = 1m tnh nh dm c 2 u ngm.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG15GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN Moment:+ Ti gi:2112bAq ltM + Ti nhp : 21124bq LM Trong :qb = qSttb (kG/m) Cc bng tnh :Ni lc trong cc bn dm sn qStt (kG/m)lt1(m)M1 (+) kG.m/mMI (-) kG.m/mS3 908.5 1.48 82.92 165.83S4 1069.88 0.7 21.84 43.69S5 908.5 0.7 18.55 37.10S6 1088.5 0.7 22.22 44.454. TNH CT THP4.1.VT LIU S DNG :-Btng s dng cho sn l btngB25 c cc ch tiu nh sau : + Khi lng ring : = 2.5 T/m3.+ Cng chu nn tnh ton : Rb = 145 kG/cm2.+ Cng chu ko tnh ton : Rk = 10.5 kG/cm2.+ Mdul n hi : Eb = 3 x 105 kG/cm2.-Ct thp s dng l thp AI vi cc ch tiu nh sau :+ Cng tnh ton : Rs = Rs = 2250 kG/cm2.+ Cng tnh ton khi dng lm ct ngang : Rad = 1800 kG/cm2.+ Mdul n hi : Ea = 2.1 x 106 kG/cm2.4.2 TNH V B TR THP :Phng php tnh :-Khi tnh thp, ct sn thnh tng di rng 1m v xem di nh mt dmc b = 100 cm v cao h = 8 cm.-Ct thp sn c tnh theo cng thc ca cu kin chu un t ct n :1 0.5 0.5(1 1 2 )m + + 0. .ssMAR h + SVTH:NGUYN XUN HNG MSSV:X070757 TRANG16200.255. .=1- 1-2mbmMR b h + +GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN Trong :min0: 0.1% = .100%b.hsAKT + ; '0ch ; ct thp gia sn l ct thp n nn: '0sA Vy: '0 ; '0 ;0 T ; cc 91 1 2M=a .q.l .l =0.0198770.6 4.23.7=237.1KGm 2 3 20237.10, 0333. 1850 10 1 0, 062cncMLR b h+Ct thp b tr theo phng cnh ngn l 6a130c AS = 2.17cm2.=> 2.17= =0.0196%1006.2 4421.1073.10abEnESuy ra:( ) ( ) + + + ++ + 01 10.2671 5 1 5 0,0333 01.8 1, 810. . 10 0, 0196 7xhL TnSVTH:NGUYN XUN HNG MSSV:X070757 TRANG21GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN ( )( ) + + 20' . . 0, 267 0 100 6.2 165.54 A b h cmbq( ) ( ) 1 1+ + 1 1 1 1 + + ] ]' ' 2 21 0'0 0.2671 . 1 6.2 5.372 0 0.267 2Z h cmTnh .1.25 .kc na cR WSM + +' 21 1(0, 292 0, 75 0,15 )nW bh+i vi tit din ch nht, ta c:1''12ssnAbhnAbh 12272.170.0381008snAbh; '10 + + 2 3(0.292 0.75 0.038 0.15 0) 100 8 2051.2nW cmTnh >2.16 2051.21.384 1237.1 10kc ncRWmM chn m = 1=> 1.251 10,25aSuy ra: ++ 2 0 115 4.6.2 5.373499735840.25 0.92110 2.17 0.45 30 10 165.54 . . .a bs s b bqh ZB KGc mEA E A = 34997KG.m2 + vng 1f ca bn sn S5 l: 4 4 1111 1 480.9. . 3.7 0.0067 0.67384 38434997cngqf l m cmBSVTH:NGUYN XUN HNG MSSV:X070757 TRANG22GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN 5.2.TNHVNGf2DOTI TRNGDI HNTCDNG NGN HN- Ti trng di hn tc dng: 2650.6 /c cq g KG m Suy ra: + +442 21 4 4 4 41 24.2. 650.6 406 /4.2 3.7c clq q KGml l+M men do ti trng: 91 1 2. . . 0,0198650.64.23.7 200.2ccM m q l l KGm 2 3 20200.20.0282. 1850 10 10.062cncMLRb h( ) ( ) + + + ++ + 01 10.381 5 1 5 0.0282 01.8 1, 810. . 10 0.0196 7xhL Tn( ) ( ) + + ' 20. . 0.38 0 100 6.2 235.6bqA b h cm( ) ( ) 1 1+ + 1 1 1 1 + + ] ]' ' 2 21 0'0 0.381 . 1 6.2 5.0222 0 0.38 2Z h cm Tnh 1.25 10.808 0.44aSuy ra: ++ 2 0 115 4.6.2 5.022249387874 .0.44 0, 92110 2.17 0, 45 30 10 235.6 . . .a bs s b bqh ZB GK c mEA E A = 24939KG.m2+ vng f2 ca bn sn S5 l: 4 4 1211 1 406. . 3.7 0,0079 0.79384 384 24939cngqf l m cmBSVTH:NGUYN XUN HNG MSSV:X070757 TRANG23GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN 5.3.TNH VNG f3 DO TI TRNG DI HN TC DNG DI HN- Ti trng di hn tc dng: 2650.6 /c cq g KG m Suy ra: + +442 21 4 4 4 41 24.2. 650.6 406 /4.2 3.7c clq q KGml l+M men do ti trng: 91 1 2. . . 0,0198650.64.23.7 200.2ccM m q l l KGm 2 3 20200.20.0282. 1850 10 10.062cncMLRb h( ) ( ) + + + ++ + 01 10.381 5 1 5 0.0282 01.8 1, 810. . 10 0.0196 7xhL Tn( ) ( ) + + ' 20. . 0.38 0 100 6.2 235.6bqA b h cm( ) ( ) 1 1+ + 1 1 1 1 + + ] ]' ' 2 21 0'0 0.381 . 1 6.2 5.0222 0 0.38 2Z h cm Tnh 1.25 0.8 0.808 0.604aSuy ra: ++ 2 0 115 4.6.2 5.022193586307 .0.604 0.92110 2.17 0, 45 30 10 235.6 . . .a bs s b bqh ZB GK c mEA E A = 19359KG.m2+ vng f2 ca bn sn S5 l: 4 4 1211 1 406. . 3.7 0,01 1384 38419359cngqf l m cmB Vy vng tn phn ca sn S5 l: + + 1 2 30.67 0.79 1 0.88 f f f f c mSVTH:NGUYN XUN HNG MSSV:X070757 TRANG24GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN vng gii hn: [f] = 1.85cm 1 < ]0.88 1.85 f cm f cm=> Vy sn S2 tha v iu kin vng.6.KIM TRA CHNG CT CHO SN:ly qtc=qtt=1020.21/1.1=927.46 KG Ct mt di sn c nhp di nht l=3.7m ,b=100cm, h=8cm tnh ton nh dm hai u ngm chu ti trng phn b ln nht ca sn ( y ta ly ti trng ln nht an ton).ta c s tnh v lc ct. Kim tra iu kin hn ch :-Btng khng b ph hoi do ng sut nn chnh QDN1 = 0.35xRnxbxh0 = 0.35x145x100x8 = 40600 kG >Q=1715.80 KG-Kh nng chu ct ca btng :Q0 = 0.6xRkxbxh0 = 0.6x10.5x100x8 = 5040 kG> Q = 1715.80 kG BT kh nng chu ct vy sn tha mn iu kin chu ct.7.KIM TRA KH NNG CHNG XUYN THNG CA SN-Kim tra kh nng chng xuyn thng cho bn sn b tng dy 8 cm. y ta khng k n s tham gia ca ct thp trong vic chng xuyn thng.Chnh v vy, kh nng chng xuyn thng thc t ca sn BTCT s cao hn kt qu m ta tnh ton sau y.-Xtlc xuyn thng do tm tng ngn t trn sn gy ra, ct tng ra tng mt di tnh ton kim tra kh nng chng xuyn thng ca sn.-Xt tng 100: lc tc dng ca tm tng cao 3.1m, di 1m, rng 0,1m).SVTH:NGUYN XUN HNG MSSV:X070757 TRANG25GVHD KC :C BCH V HONG LAN GVHDTC:THY L VN THNG N TT NGHIP KSXD KHA 2007-2012CHUNG C NG THUN P = lt x hr x bt x t =1x 3.1 x 0,1 x1800 = 558KG.-Thp xuyn thng do on tng 1m gy ra c minh ha nh trn hnh -Kh nng chng xuyn thng ca b tng:P 0.75Rbtbtbho bbt : gi tr trung bnh ca chu vi hai y ca thp nn thng, y ln ly mc ct thp.( )( ) ( ) + + ++ + + + + 002 2( 4 )2 4 2 0,11 40,062 2.4482btb l b l hb b l h m-Kh nng chng xuyn thng: 1 ] 0.75 0,75105000 2.4480.062 11952.36bt tb oQ R b h KG1 < ]558 11952.36 P KG P KGnn sn m bo kh nng chng xuyn thng.-Tng txt tng 200: Lc tc dng ca tm tng cao 2.9 m, di 1m, rng 0,2m): P = 1044KG< [Q] = 12928KG nn sn m bo kh nng chng xuyn thng.SVTH:NGUYN XUN HNG MSSV:X070757 TRANG26SN DY 80 cm