右图BC:
∑MB=0 2a.NC.cosθ.-a.p.sinθ-(a/2)q.a=0 ,(1)-->可求出 NC ;
左图整体:
∑Fx=0 -NC.sinθ-pcosθ+qm.a/2+NAx=0 ,(2)
∑Fy=0 -NC.cosθ-psinθ-2q.a+NAy=0 ,(3)
∑MA=0
a.NC.sinθ+3a.NC.cosθ+2a.psinθ+a.pcosθ-2q.a.a-(qm.a/2)(a/3)+M+M'=0 ,(4)
--> (2)(3)(4)联立可得:NAx、NAy、M'