8.4 moment-area method(弯矩面积法) Deflected structure- M The first moment theorem .do =d 喘 = △日 The second moment theorem -岩 程学院A Example 1 constant 0= 2 始 PP2 PP M 0a=0A+0合=0+ 2E1 2E1 3 H PP 0=0 (boundary condition) 3El Tangent at A A 208 PL Negative moment △=4g △g=△g= (convex curvature) 3E/ Tangent at B 0g 气程学院