Hysteretic Model For Predicting Seismic Behavior Of RC Shear Walls Considering The Strain Rate Effect

Reinforced concrete (RC) shear walls are the most commonly used lateral force-resisting members in the high-rise buildings under seismic load. The seismic dynamic responses of the RC shear walls can affect the safety performance of buildings. However the phenomenon of low effectiveness and non-convergence exists in the computation of the elastic-plastic earthquake response of RC shear wall structures considering the dynamic effect. Hence proposing a simple and effective analytical model for shear wall considering dynamic effect is of priority in the research of elastic-plastic seismic response of RC shear wall structures. This article focuses on A RC Shear wall model considering dynamic effect and following topics are studied.(1) Based on the quasi-static and dynamic loading tests of nine RC shear walls, the effect of the strain rate on the hysteretic bone curve and hysteretic rules are analyzed. A restoring force model considering strain rate effect is proposed and meanwhile the corresponding MATLAB program is developed.(2) A verification of the proposed model is conducted by the aforementioned experiment and other researches on the shear wall seismic dynamic performance and the validity of the model is confirmed.(3) Applying the restoring force model into the structure dynamic analysis with the purpose of studying the influence of strain rate on structure seismic response from the perspective of member. The seismic dynamic response of a six-floor RC shear wall building is analyzed with and without strain rate effect in MATLAB, mainly comparing the strain rate effect on the acceleration of the building, the maximum displacement, story drift and base shear. Results show that ductility reduces, base shear increases and brittle failure occurs earlier when considering strain rate effect.(4) A preliminary research is carried out on the application of strain rate in MIDAS GEN for a real shear wall structure. And then comparison of structural dynamic response with and without strain rate effect is made, and the results show a good accordance with previous analysis.