考虑限位器影响的山区连续梁桥地震响应分析

为研究限位器对桥梁结构抗震性能的影响,以一座山区典型连续梁桥为对象,采用非线性时程分析法对桥梁有限位器和无限位器时的地震响应进行对比分析,在此基础上进一步分析了梁端碰撞刚度、限位器刚度和限位器松弛长度3个参数对结构地震反应的影响。分析结果表明:伸缩缝处安装墩梁连接式限位器后,会显著增大过渡墩的地震需求;碰撞刚度、限位器刚度和限位器松弛长度的取值对结构的地震反应有重要影响,选取合理的参数可以有效提升桥梁结构的整体抗震性能。

Earthquake response analysis of continuous girder bridges in mountain area considering effect of restrainers

To study the influences of restrainers on seismic behavior of bridge structures,a typical continuous girder bridge in mountain area was studied.The seismic performances of the bridge with and without restrainers were compared and analyzed by the method of nonlinear time-history analysis.The seismic responses of the bridge affected by restrainer parameters,such as impact stiffness,restrainer stiffness and restrainer slack were investigated.Results indicated that the seismic demand of piers at the expansion joints was increased when the effect of the restrainers between girder and pier was considered.Above parameters had an important effect on longitudinal seismic response of continuous girder bridge,and reasonable parameters could improve the seismic performances of the bridge structure.