例题 例题7 §8虛位移原理 列虚功方程: SWM=-MOPL B SWo=3a25o A∥C OWM=Mso W=0 MA8+3aQ+M6(2=0 ●● 代入O2=26 (-M4+3aQ+2M)6=0:q≠0 MA=3+2M1()例 题 7 §8 虚位移原理 例题 0 1 = = n i Wi − MA 1 +3aQ 1 + M 2 = 0 a b a a A B C D Q M M A 1 2 WM A = −M A 1 WQ = 3aQ 1 WM = M2 列虚功方程: 代入 2 = 21 (−MA +3aQ+ 2M) 1 = 0 1 0 MA = 3aQ+ 2M1 ()