,=0.V,=0 C 2=1 V=O B c左=日C右 x=0.V=0C左二C右 RB l B X- B EA 四、弯曲刚度条件: maX maXx l,V 0 x 0,V 0 2 B 1 A = = = = 左 右 左 右 C C C C V V l x = = =   2       = = = = EA ql a 2 1 x l,V x 0,V 0 B A 四、弯曲刚度条件：              max max f f