doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan
TRANSCRIPT
![Page 1: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/1.jpg)
Ch¬ng6
dÇmchÞuuènngangph¼ng
V/vÏbiÓu®ånéilùctheoph¬ng
ph¸pnhËnxÐtnh÷ng
®iÓm®ÆcBiÖt
![Page 2: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/2.jpg)
AB
C
5KN/ mq P = 10KN
XA
ya yB
1010
12,5
7,5
Q
KN
= 7,5KN = 22,5KN
4-x =2,5m
A B C
D
0 0
10
M
KN.mBA
5,625
D
= 5KN/ mq = KN
4mX
ya yB
12,5
7,5
Q
KN
= 7,5KN = 22,5KN
x = 1,5mAC
D
M
KN.m5,625
M
KN.mC
5,625
1m
• S ¬ ®å 1
![Page 3: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/3.jpg)
P = 20KN=
2000 2000 2000
A BC D
m= 4KN.m
yB = y = 6KNya= 14 KN
14
6 KN
Q
0 0
16
12
28
KN.m
M
14
6
• S ¬ ®å 2
![Page 4: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/4.jpg)
Môc tiªu bµi häc
Trang bÞ: Kü n¨ng, tr×nh tù c¸c b íc vÏ biÓu ®å néi lùc b»ng ph ¬ng ph¸p nhËn xÐt theo nh÷ng ®iÓm ®Æc biÖt cho dÇm chÞu uèn ngang ph¼ng.
![Page 5: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/5.jpg)
NhËn xÐt Nguyªn t¾c
AB
C
5KN/ mq P = 10KN
XA
ya yB
1010
12,5
7,5
Q
KN
= 7,5KN = 22,5KN
4-x =2,5m
A B C
D
0 0
10
M
KN.mBA
5,625
D
= 5KN/ mq = KN
4mX
ya yB
12,5
7,5
Q
KN
= 7,5KN = 22,5KN
x = 1,5mAC
D
M
KN.m5,625
M
KN.mC
5,625
• S ¬ ®å 1
1m
![Page 6: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/6.jpg)
NhËn xÐt Nguyªn t¾cP = 20KN=
2000 2000 2000
A BC D
m= 4KN.m
yB = y = 6KNya= 14 KN
14
6 KN
Q
0 0
16
12
28
KN.m
M
14
6
• S ¬ ®å 2
![Page 7: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/7.jpg)
2m 2m 2m
A BC D
P = 20 KN= m= 4KN. m
yB = y = 6KNya= 14 KN
14
6 KNQKN
14
6
A BC
P = 10KN
XA
ya
y B1010
12, 5
7,5 KN Q
KN
= 7,5 KN = 22, 5 KN
x
4-x
= 1,5m
=2,5 m
A B CD
X
KN
=
x
x
,5m
2,5
A CD
4 m 1 m
q = 5 KN/m
Nh÷ngnhËnxÐt®ÓvÏbiÓu®ålùcc¾tq
NhËn xÐt 1:+ T¹i mÆt c¾t cã P
NhËn xÐt 2: + T¹i mÆt c¾t cã m
S ¬ ®å 1
S ¬ ®å 2
![Page 8: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/8.jpg)
Nh÷ngnhËnxÐt®ÓvÏbiÓu®ålùcc¾tq
NhËn xÐt 4: + Trong ®o¹n dÇm cã
aqz
NhËn xÐt 3: + Trong ®o¹n dÇm cã
0zq
• S ¬ ®å 1
AB
C
5 KN/ mq P = 10KN
4m 1m
XA
ya yB
1010
12,5
7,5
Q
KN
= 7,5 KN = 22,5 KN
x
4 -x
= 1,5m
= 2,5m
A B C
D
= 5 KN/ mq = KN
4m 1m
X
ya yB
12,5
7,5
Q
KN
= 7,5 KN = 22,5 KN
x
x
,5m
2,5m
AC
D
![Page 9: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/9.jpg)
Nh÷ngnhËnxÐt®ÓvÏbiÓu®ålùcc¾tq
S ¬ ®å 1
AB
C
5 KN/ mq P = 10KN
4m 1m
XA
ya yB
1010
12,5
7,5
Q
KN
= 7,5 KN = 22,5 KN
x
4 -x
= 1,5m
= 2,5m
A B C
D
= 5 KN/ mq = KN
4m 1m
X
ya yB
12,5
7,5
Q
KN
= 7,5 KN = 22,5 KN
x
x
,5m
2,5m
AC
D
NhËn xÐt 5: + L îng biÕn ®æi Q gi÷a hai mÆt c¾t
qBC
qAB
FQQ
FQQ
qFQQ TP
![Page 10: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/10.jpg)
Nh÷ngnhËnxÐt®ÓvÏbiÓum«menuènm
NhËn xÐt 1:+ T¹i mÆt c¾t cã P
NhËn xÐt 2: + T¹i mÆt c¾t cã m
S ¬ ®å 1
AB
C
5KN/ mq P = 10KN
4m 1m
XA
ya yB= 7,5KN = 22,5KN
= 5KN/ mq = KN
4m 1m
X
ya yB= 7,5KN = 22,5KN
0 0
10
M
KN.mBA
5,625
D M
KN.m5,625
M
KN.mC
5,625
P = 20 KN=
2m 2m 2m
A BC D
m= 4KN.m
yB = y = 6KNy a = 14 KN
0 0
16
12
28
KN.m
M
S ¬ ®å 2
![Page 11: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/11.jpg)
NhËn xÐt 3: + Trong ®o¹n dÇm cã
0zq
NhËn xÐt 4: + Trong ®o¹n dÇm cã
aqz
Nh÷ngnhËnxÐt®ÓvÏbiÓu®åm«menuènM
• S ¬ ®å 1
P = 20 KN=
2m 2m 2m
A BC D
m= 4KN.m
yB = y = 6KNy a = 14 KN
0 0
1612
28
KN.m
M
• S ¬ ®å 2
AB
C
5KN/ mq P = 10KN
4m 1m
XA
ya yB= 7,5KN = 22,5KN
= 5KN/ mq = KN
4m 1m
X
ya yB= 7,5KN = 22,5KN
0 0
10
M
KN.mBA
5,625
D M
KN.m5,625
M
KN.mC
5,625
![Page 12: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/12.jpg)
Nh÷ngnhËnxÐt®ÓvÏbiÓu®åm«menuènm
NhËn xÐt 5: + L îng biÕn ®æi M gi÷a hai mÆt c¾t
QFMM TP
AB
C
5KN/ mq P = 10KN
4m 1m
XA
ya yB
1010
12,5
7,5QKN
= 7,5KN = 22,5KN
x
4-x
= 1,5m
=2,5m
A B CD
0 0
10
M
KN.mBA
5,625
D
= 5KN/ mq = KN
4m 1m
X
ya yB
12,5
7,5QKN
= 7,5KN = 22,5KN
x
x
,5m
2,5m
A CD
M
KN.m5,625
M
KN.mC
5,625
S ¬ ®å 1
QFMM AD
QFMM DB
![Page 13: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/13.jpg)
Tr×nhtùc¸cbícvÏq,mtheoph¬ngph¸pnhËnxÐtnh÷ng
®iÓm®ÆcbiÖt
+ B íc1 : x¸c ®Þnh ph¶n lùc + B íc 2: ph©n ®o¹n t¶i träng + B íc 3: VÏ biÓu ®å lùc c¾t Q + B íc 4: vÏ biÓu ®å m«men uèn M
![Page 14: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/14.jpg)
•VÝdô:VÏbiÓu®ånéilùcchodÇmchÞulùcnhh.vÏ
A BC
P = 20KN= 5KN/ mq= 5KNq
2000 4000
![Page 15: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/15.jpg)
+ B íc 1: X¸c ®Þnh ph¶n lùc : (1) x= 0 XA= 0
(2) y = 0 YA+YB - q.4 - P = 0
(3) mA(F) = 0 YB.6 - q.4.4 - P.2 = 0
YB =20 KN thay vµo (2) YA= 20KN
+ B íc 2: Ph©n ®o¹n t¶i träng : 2 ®o¹n AC ; CB
A BC
P = 20KN= 5KN/ mq= 5KNq
2000 4000
ya = 20 KN yB= 20 KN
Xa= 0
![Page 16: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/16.jpg)
+ VÏ biÓu ®å lùc c¾t Qy
• §o¹n 1: A C+T¹i A cã YA= 20KNQ=20KN
+Tõ AC cã qz= 0 Q h»ng sè // ® êng chuÈn
+ T¹i C ta cã P =20KNQ =20KN
• §o¹n 2: C B+Tõ B C: qZ = h»ng sèQ ®
êng bËc 1 QB = QC – Fq= 0 – 20 = - 20KN
+T¹i B cã YB= 20KNQ=20KN kÕt thóc trë vÒ ® êng chiÈn
ABC
P = 20KN= 5KN/ mq= 5q
2000 4000
ya = 20 KN yB = 20 KN
Xa = 0
20
KN
Q0
20
20
![Page 17: Doko.vn 158762-ve-bieu-do-noi-luc-theo-phuong-phap-nhan](https://reader033.vdocuments.pub/reader033/viewer/2022052907/558e75541a28abd8478b462c/html5/thumbnails/17.jpg)
+ VÏ biÓu ®å m«men Mx
§o¹n 1: AC-T¹i A cã MA=0
-Tõ AC v× qz= 0 nªn M bËc 1
MC=MA+FQ= 0 + 20.2 = 40 KN.m
§o¹n 2: CB-T¹i C cã MC= 40KN.m
-Tõ C B cã qz= h.sè nªn M bËc 2
-T¹i C: MB=MC-FQ= 40 - 40 = 0
MB= 0 KN.m
0 0
40
M
KN.m
MM
ABC
P = 20KN= 5KN/ mq= 5q
2000 4000
ya = 20 KN yB = 20 KN
Xa = 0
20
20 KN
Q
20
0