写出图示各梁的边界条件
习题6.4 用积分法求图示各梁的挠曲线方程，端截面转角θA和θB 跨度中点的挠度和最大挠度。设EI为常量。 A 解： lMe FA = FB = l Me M= x lFA(a)
BFB
Me 2 EI θ = x +C 2l
Me 3 EIw
= x + Cx+ D 6l
x=0
w= 0
D=0
x =l
w= 0
1 C =- Mel 6
Me θ= (3 x2- 2 ) l 6 EIl Ml θA =- e 6 EI
Me 3 2 w= (x - x) l 6 EIl
θB =
Mel 3 EI
Mel 2 wl =- 16EI 2
M dw = θ = e (3 x2- 2 ) = 0 l dx 6 EIl3 Mel 2 wmax =- 27EI
x=
l 3