4.6 Strategy for planar truss analysis E 60 kips XED ED FED FEC Method of joints (结点法) 60 kips 一FFE 20 15 Method of sections 士示红程学院 (截面法) 4.7 Condition equations Hinge.M=0 0 d Hinge.M=0 Hinge.Mez=0 Parallel members,P O in panel be a