Equivalent bilinear SDOF system of fabricated concrete shear wall structure

Abstract

Due to the innovation of construction technology, the seismic response, failure mechanism and resilience characteristics of prefabricated concrete shear wall structures have changed. Based on the previous shaking table test of the fabricated concrete shear wall structure of the research group, the characteristic parameters such as displacement response and earthquake action are obtained, and a bilinear SDOF system controlled by the basic model is established. First, based on the seismic response data of the test structure, a bilinear hysteretic model is established, and its restoring force characteristic parameters are calculated. Furthermore, the nonlinear SDOF system is excited under the same seismic conditions as the test structure, and its seismic response and energy dissipation capacity are calculated. The results show that the calculated values of the SDOF system in the first stage (PGA 0.07-0.40g) are in good agreement with the experiments, but the agreement is reduced in the strong earthquake stage (PGA 0.62-0.90g). The nonlinear characteristics and damping of the SDOF system under the earthquake act together to dissipate the seismic energy, and the first stage is dominated by the damping energy dissipation. It is hoped that this study can provide a reference for the seismic design of related projects.