Procedure of equilibrium methods The original structure Restrain each structure displacement component The number of restraints qives the degree of A kinematically kinematic indeterminacy determinate primary structure The individual members are under load in the restrained position Relax the artificially imposed restraints Equilibrium must be satisfied for each The original structure displadement degree of freedom. Member force-deformation relationship A simple problem Member force- deformation relationship N=EAA B P EA Y=0 EA N,= equilibrium xd=P EAx equation L 冠月海大学 土床工程学院