例题 例题7 §8虛位移原理 ∑ SW.= OOr+ F,or-M0o=0 B M A GO+FAy a 6r,=0 ∵C≠0 M D ●● F,=O+ (↑)例 题 7 §8 虚位移原理 例题 (− + − ) = 0 A y A r a M Q F a b a a B C D Q M A FAy C r A r B r −Qr + F r − M = 0 B A y A = = n i Wi 1 即 rA 0 a M FAy = Q + ()