q用等效力P代替,P作用点在BA中点,P的大小等于q分布三角形面积 =(1kN/m).3m/2 =1.5KNΣFx =0,FBx =0ΣMA =0,F.3m -FBy.2m +P.1m =02KN.3m -FBy.2m +(1.5KN).1m FBy =3.75KN（向上）ΣMB =0,FA.2m +F.1m -P.1m =0FA.2m...