城市轨道交通高架桥无缝钢轨的抗震作用

摘要

From the rail bridge aseismatic structure system, full bridge model of city orbit traffic is built to genereate the accurate simulation of the two most important boundary conditions ： the role of rail in rail bridge seismic degsign ; under rare earthquake of the pile soil interaction, the introduction of popular P-Y curve method of United States of America engineer- ing. In depth analysis of the seismic effect of seamless rail in rail transit viaduct, the results show that the rail along the bridge has obvious restrain effect, causing the decrease of displacement of pier top; city rail bridge modeling analysis should include rail iniluence to the whole structure, and the rail should be extended to both sides.%从轨道桥梁的抗震结构体系入手建立城市轨道交通全桥三维模型,准确模拟两个最重要的边界条件：一是钢轨在轨道桥梁抗震中的作用;二是在罕遇地震下的桩土相互作用,引进美国工程界比较流行的P-Y曲线法。深入分析了无缝轨道在轨道交通高架桥梁抗震的作用,结果表明顺桥向钢轨对桥梁有明显的约束作用,造成墩顶位移的减小。在城市轨道桥梁建模分析中,应该包括钢轨对整体结构的影响,并将钢轨向两侧延长。