减震榫在高烈度地震区高速铁路连续梁桥中的应用研究

Research on application of damping tenon in high-speed railway continuous beam bridges in high-intensity seismic area

为探明减震榫在高烈度地震区高速铁路连续梁桥中的适用性,有效提高桥梁抗震性能,开展三向限位减震榫在高烈度地震区高速铁路桥梁抗震效果的对比分析及性能试验研究。以渝昆高铁某典型三跨混凝土连续梁桥为工程背景,对比分析普通支座、减隔震支座、减隔震支座+减震榫3种不同减震措施下桥梁的抗震性能。在此基础上,通过开展三向限位减震榫的足尺性能试验研究,获得了减震榫的滞回耗能曲线,以等效黏滞阻尼系数为耗能指标,获得其耗能能力与延性变形规律。研究结果表明:三向限位减震榫可有效降低固定墩的墩底内力,耗能能力随着榫顶位移增大而增大。相关成果可为处于强震区的铁路混凝土桥梁减震设计提供参考。

This paper investigated the applicability of damping tenon in high-intensity earthquake areas,and effectively improved the seismic performance of high-speed railway continuous beam bridges.The comparative analysis and performance tests about the seismic effect of a three-way limiting damping tenon in high-speed railway bridges,which were located in the high-intensity earthquake area,were carried out.Taking a typical threespan concrete continuous beam bridge of Chongqing-Kunming high-speed railway as the engineering background,the seismic performance of the bridge under three different seismic mitigation measures,including ordinary support,seismic isolation support,and seismic isolation support with additional damping tenon,were comparatively analyzed.On this basis,the hysteretic energy consumption curve of the three-way limit damping tenon was obtained by carrying out a full-scale performance test.The relationship between the energy consumption capacity and the ductility deformation was established by taking the equivalent viscous damping coefficient as the energy consumption index.The results show that the three-way limiting damping tenon can effectively reduce the internal force of the fixed pier bottom,and the energy dissipation capacity of the device increases with the increase of the top displacement.The results can provide a reference for the seismic design of concrete railway bridges in high-intensity seismic areas.