The type of hysteresis loops can arbitrarily be chosen, and the corresponding element stiffness matrix can be built up in a simple way.
弯矩—曲率恢复力曲线可以是任意的，而相应的单元刚度矩阵的建立较为简单。
2
To investigate the hysteresis behavior of composite steel frame with PR connection-reinforced concrete infill wall structural systems, a nonlinear finite element program SRCWNP was developed.