Research on the hysteretic model and parameter identification of #br#
S-shaped steel plate damper
Zhai Zhipeng1,2,3 Guo Wei1,2,3 Yu Zhiwu1,2,3
1. School of Civil Engineering, Central South University, Changsha 410075, China；2. National Engineering Laboratory for High Speed Railway
Construction, Central South University, Changsha 410075,China; 3. Engineering Technology Research Center for Prefabricated Construction
Industrialization of Hunan Province, Changsha 410075, China
Abstract：A new type of S-shaped steel plate damper was proposed. To investigate the deformation and failure mode, hysteretic characteristics and energy dissipation capacity, three test specimens were designed for quasi-static tests. Based on the test results, an improved BWBN hysteretic model was proposed to simulate the damper’s hysteretic behavior. Then the Simulink model was established and the parameter identifications were conducted. Analysis results show that the damper has pump hysteretic loops, large deformation capacity, stable energy dissipation capacity, high ductility coefficient and over-strength coefficient. It consumes energy through bending and axial deformation. The force-displacement relationship includes bending elastic stage, bending yield stage and bending-tension yield stage. Due to the bending-tension hardening effect, the bearing capacity and stiffness at the third stage increase gradually, which can enlarge the bearing capacity and reduce the residual deformation of structures. The presented hysteretic model can perform the damper’s bending-tension hardening effect, and can accurately predict the hysteretic curve, restoring force variation and cumulative energy dissipation of the damper.
