题46图示外伸梁,试作剪力图和弯矩图 20/N 40kN·m 10kN/m F -20kN A B 0<x1<1 35KN 4m 25kN (x)=-20x 5 2.5 0≤x,<1 F(x2)=-25+10x2 KN 0-x2<4 20 25 25x-10 2 0≤x2<4 20 31.25 kNm图示外伸梁,,试作剪力图和弯矩图. 4m 20kN 40kNm 10kN m 1m A B 例题 4.6 35kN 25kN X1 FS (x1 ) = −20kN 0  x1 1 ( )1 20 1 M x = − x 0  x1 1 X2 ( ) 2 2 F x 25 10x S = − + 0  x2  4 ( ) 2 25 10 2 2 2 2 x M x = x −  0  x2  4 20 15 25 2020 2.5 31.25 kN kNm