基于高阻尼橡胶支座双折线与速度相关模型的结构响应对比

Comparative Structural Response of Bilinear Model and Rate-dependent Model of High Damping Rubber Bearing

高阻尼橡胶支座具有很强的速度相关性,但传统规范采用的是未虑速度相关性的双折线模型。为了研究支座速度相关性对结构的影响,本文选择了考虑速度相关性的改进超弹性Zener模型和传统双折线模型进行对比分析。本研究选择了一栋7层混凝土框架结构,在近断层地震波和远场波作用下,用ANSYS分别计算了采用双折线模型和超弹性Zener模型后结构的地震响应,分析了采用两种模型后结构的楼层剪力、楼层位移,对比了支座滞回曲线。结果表明,和双折线模型相比,超弹性Zener模型滞回耗能更多,采用超弹性Zener模型的结构有更低的楼层剪力,更大的楼层位移,Zener模型能更真实地反映结构响应。

The high-damping rubber bearing has a strong velocity dependency,but a bilinear model without considering the velocity dependency is used on the traditional code.In order to study the effect of the velocity dependency on the structure,the velocity dependent Hyperelastic Zener Model and the Bilinear Model are selected in this paper for comparative analysis.A 7-story concrete frame structure is selected in this research.Under the action of near-break and far-field seismic waves,the seismic response to the structure after adopting the Bilinear Model and the Hyperelastic Zener Model is calculated by ANSYS;and the floor shear of the structure after adopting the two models is analyzed.Comparing the hysteresis curve of the bearing with floor force and floor displacement,the results show that the Zener model consumes more hysteresis energy compared with the Bilinear Model.The structure adopting the Zener model has lower floor shear and greater floor displacement,and Zener Model can reflect the structure response more realistically.