A rate-dependent constitutive model of high damping rubber bearings considering #br# the influence of compressive load and its effect on the seismic response
Wei Wei1 Yuan Yong1 Tan Ping2 Zhu Hongping1
1. School of Civil Engineering and Mechanics, Huazhong University of Science & Technology, Wuhan 430074, China;
2. Earthquake Engineering Research and Test Center, Guangzhou University, Guangzhou 510405, China
Abstract：Isolation bearings are important devices in the base-isolated structures, high damping rubber bearings (HDRBs) possess desirable isolation performance and environmentally friendly characteristic. However, the mechanical properties of HDRBs are complicated, and the stress-strain curve may be affected by the comprehensive force, loading rate, etc. In this study, a rate-dependent constitutive model of the HDRB considering the influence of compressive force was proposed and its effects on the seismic response of structures were studied. Firstly, the influences of loading rate and compressive force on the mechanical behavior of HDRB were investigated by conducting multi-step relaxation tests and cyclic shear tests at different compressive forces and loading rates. Then, a rate-dependent constitutive model of HDRB was developed based on the improved hyperelastic Zener model, which may consider the effects of loading rate and compressive force simultaneously. The model parameters were identified from the material test results, and bearing tests were carried out to verify the accuracy of the model. Finally, the seismic response of an isolated structure under the far-field and near-fault pulse-like ground motions was evaluated by different mechanical models of the HDRBs to investigate its overall seismic performance. It is found that the rate-dependent behavior of HDRBs appears to be more evident under the near-fault pulse-like ground motions, and it may influence the seismic response of isolated structures and shall be paid attention in the isolation deign.
魏威 袁涌 谭平 朱宏平. 考虑压力影响的高阻尼橡胶隔震支座速度#br# 相关性本构模型及其地震响应研究[J]. 土木工程学报, 2020, 53(2): 23-32.
Wei Wei Yuan Yong Tan Ping Zhu Hongping. A rate-dependent constitutive model of high damping rubber bearings considering #br# the influence of compressive load and its effect on the seismic response. 土木工程学报, 2020, 53(2): 23-32.
