采用摩擦摆支座及U型钢防落梁装置的高速铁路简支箱梁桥地震响应敏感性分析

Sensitive Analysis on Seismic Response of Simply Supported Box Girder Bridge on High Speed Railway Using Friction Pendulum Bearings and U-shaped Steel Combined Earthquake Protection Device

以高速铁路简支箱梁桥隔震研究为例,建立了采用摩擦摆支座与U型钢防落梁装置组合地震保护方案的全桥地震响应分析模型,针对支座位移、墩底剪力、墩底弯矩等地震响应,考虑了场地类别、桥墩高度、桥梁跨数、桥梁跨度、激励方向等影响因素,并根据各因素选定的水平级别,实施了混合正交试验,再应用极差分析方法对支座位移、墩底剪力、墩底弯矩等地震响应进行了影响因素的敏感性分析,明确了各因素对相关响应量影响的主次情况,为高速铁路简支箱梁桥隔震研究及优化设计奠定了基础。

In this paper,the seismic isolation of simply supported box girder bridges on high speed railway was studied.A bridge model with friction pendulum bearings and a U-shaped steel combined earthquake protection device was built for seismic response analysis,including the seismic response of bearing displacement,and shear and moment at the pier bottom.Multiple factors including site types,pier height,number of bridge spans,bridge span length and excitation direction were considered.A mixed orthogonal test was carried out according to the selected level of each factor.Using range analysis method,sensitivity analysis of each factor was carried out on the seismic response of bearing displacement,and shear and moment at the pier bottom.The primary and secondary cases of the impact of various factors on the relevant response were analyzed.It may provide guidelines for seismic isolation and design optimization of simply supported box girder bridges on high speed railway.