考虑滑移效应的板式橡胶支座力学性能试验研究

Experimental Study on Mechanical Properties of Laminated Rubber Bearing Considering Slip Effect

板式橡胶支座是公路桥梁减隔震体系的重要组成部分,建立合理的板式橡胶支座力学本构模型是准确建立有限元模型进行桥梁抗震性能分析的关键。对4个板式橡胶支座进行拟静力加载试验,分析竖向荷载对支座力学性能的影响。在此基础上,结合不同阶段的支座行为与滞回曲线确定板式橡胶支座的力学本构模型。结果表明:随加载位移的增加,支座滑动现象明显;拟静力加载试验得到的滞回曲线与本文提出的三折线力学本构模型拟合程度较好。研究为中小跨径梁桥抗震设计和性能评价提供了合理的依据。

The laminated rubber bearing is a kind of bridge bearing commonly used in seismic isolation system of highway bridge.Establishing a reasonable mechanical constitutive model of laminated rubber bearing is the key to accurately establish a finite element model for the analysis of the seismic performance of bridge.In this paper,we carried out a pseudo-static loading test on four laminated rubber bearings,and analyzed the influence of vertical load and loading speed on the mechanical properties of the support.On this basis,we determined the mechanical constitutive model of the laminated rubber bearing by combining the bearing behavior and hysteresis curve at four stages.The results show that the sliding phenomenon of bearing is obvious with the increase of loading displacement,and the fitting of hysteresis curves obtained by the pseudo-static loading test and the three-fold line mechanical constitutive model proposed in this paper is good.The study results in this paper could provide a reasonable basis for the seismic design and performance evaluation of small-to-medium span bridges.