2、平面任意力系向作用面内一点简化·主矢和主矩 F'R F=F M,=MCF 0 M n 0(1n Fk=∑F=∑F Mo=∑M1=∑M(F)2、平面任意力系向作用面内一点简化·主矢和主矩 ( ) F1 F1 M1 M0 F1      = = ( ) F2 F2 M2 M0 F2      = = ( ) Fn Fn Mn M0 Fn      = =    =   =   FR Fi Fi   ( ) MO Mi MO Fi  =  = 