1、试求图示各梁中指定截面上的剪力、弯矩值。
解：题(a) 题(b) 题(c) 题(d) A 截面－F b
Q =a +b F P , M =0 C 截面－F b Q =
a +b F M =ab P , a +b F P D 截面－F a Q =-
a +b F , M =ab P a +b F P B 截面－F a
Q =-
a +b
F P , M =0 A 截面－F M 0
Q =
a +b
, M =0 C 截面－F M 0Q
=
a +b , M =a
a +b M 0 D 截面－F M 0Q =-
a +b , M =b
a +b M 0 B 截面－F M 0
Q =-
a +b
, M =0 A 截面－F 5Q =3qa , M =0
C 截面－F 572
Q =3qa , M =6qa
B 截面－F 1
Q =-3qa , M =0
A 截面－F 132
Q =2ql , M =-8qa
C 截面－F 112
Q =2ql , M =-8qa
D 截面－F 112
Q =2ql , M =-8
qa
B 截面－F Q =0, M =0
题(e) A 截面－F Q =-2F P , M =F P l C 截面－F Q =-2F P , M =0
B 截面－F Q =F P , M =0
题(f) A 截面－F Q =0, M =
F P l 2
C 截面－F Q =0, M =
F P l 2F P l
2
D 截面－F Q =-F P , M =
B 截面－F Q =-F P , M =0
2
试建立图示各梁的剪力方程和弯矩方程，试画出图示各梁的剪力图和弯矩图
解： F
2
F
qa
F
F
F
解： F
qa 2
解： F
2
F
ql
F
解：
F
解： F
2
F F
1、试求图示各梁中指定截面上的剪力、弯矩值。
解：题(a) 题(b) 题(c) 题(d) A 截面－F b
Q =a +b F P , M =0 C 截面－F b Q =
a +b F M =ab P , a +b F P D 截面－F a Q =-
a +b F , M =ab P a +b F P B 截面－F a
Q =-
a +b
F P , M =0 A 截面－F M 0
Q =
a +b
, M =0 C 截面－F M 0Q
=
a +b , M =a
a +b M 0 D 截面－F M 0Q =-
a +b , M =b
a +b M 0 B 截面－F M 0
Q =-
a +b
, M =0 A 截面－F 5Q =3qa , M =0
C 截面－F 572
Q =3qa , M =6qa
B 截面－F 1
Q =-3qa , M =0
A 截面－F 132
Q =2ql , M =-8qa
C 截面－F 112
Q =2ql , M =-8qa
D 截面－F 112
Q =2ql , M =-8
qa
B 截面－F Q =0, M =0
题(e) A 截面－F Q =-2F P , M =F P l C 截面－F Q =-2F P , M =0
B 截面－F Q =F P , M =0
题(f) A 截面－F Q =0, M =
F P l 2
C 截面－F Q =0, M =
F P l 2F P l
2
D 截面－F Q =-F P , M =
B 截面－F Q =-F P , M =0
2
试建立图示各梁的剪力方程和弯矩方程，试画出图示各梁的剪力图和弯矩图
解： F
2
F
qa
F
F
F
解： F
qa 2
解： F
2
F
ql
F
解：
F
解： F
2
F F