橡胶支座速度相关性对高架桥地震响应的影响

Influence of Rate-dependent Rubber Bearings on Seismic Response of High-way Bridges

本文通过实时子结构实验,从结构角度分析橡胶支座速度相关性对高架桥在不同地震强度响应下的影响。通过对比支座位移、桥面位移和桥面加速度等参数,研究多跨连续高架桥在不同地震强度下的响应。实验结果表明:三种类型支座(特别是高阻尼支座和超高阻尼支座)速度相关性对桥梁地震响应有显著影响,高阻尼和超高阻尼支座对应指标变化幅度分别超过20%和30%。数值分析采用改进Zener模型模拟支座速度相关性,对比试验结果表明,该模型在地震响应分析中优于传统的双折线等模型。

This paper mainly studies the influence of mechanical behavior of rubber bearings on seismic response of typical multi-span continuous girder high-way bridges at structural level through real-time hybrid simulation(RTHS)tests.In the RTHS tests,the influences of the rate-dependent behavior of bearings on the seismic response of the bridge were investigated by comparing a series of parametric including bearing displacement,deck displacement and deck acceleration and so on.The results indicated that the earthquake response of the bridge was markedly affected particularly in the case of HDRBs and SHDRBs which have been more than 20%and 30%by all three types of rate-dependent rubber bearings.At last,the numerical simulation used a modified Zener analytical model to simulate the rate-dependent behavior of rubber bearings.Comparing the tested results,it indicated that the modified model performed better than other models like bilinear model in the seismic response analysis.