求形心主轴位置: 2=h-x广+a-A-) h+(n-1)A.h X,= 2 bh+(n-1)A. Moment of inertia: L-9x+h-x门+n-A-x)广 B。=EI。( ) ( 1) ( ) 2 1 2 1 0 0 2 0 2 0 bx b h x n A h x s s s bh n A bh n A h x ( 1) ( 1) 2 1 0 2 0 2 0 0 3 0 3 0 0 [ ( ) ] ( 1) ( ) 3 x h x n A h x b I s 0 0 B E I c 求形心主轴位置: Moment of inertia: