A restoring force model of steel-reinforced concrete square column and steel beam joint with bolted end-plate is the fundamental element of describing the elastic-plasticity performance of a joint under cyclic load.So it is significant to earthquake-resistance performance of joints and computer simulation. Based on the test data,the fitting method and dimensionless method were used to calculate the skeleton curve,the regularity of rigidity degeneration of either loading or unloading condition and hysteretic...