轨道约束对简支梁桥弹塑性地震反应的影响

Influnce of Rail Restraint on Elasto-plastic Seismic Response of Simply Supported Girder Bridge

摘要:

结合高速铁路多跨简支梁桥及轨道系统的特点,建立了考虑钢轨、轨道板、轨道扣件摩擦以及桥梁结构的线桥一体化模型,采用非线性时程反应分析研究了轨道约束系统所选桥跨桥墩的弹塑性地震反应影响。结果表明:对相邻墩高相差较大的多跨简支梁桥,轨道约束系统对桥墩的弹塑性地震反应影响较大。建议对此类桥梁应采用线桥一体化模型进行弹塑性地震反应分析。

Abstract:

Based on the properties of multi-span simply supported girder bridges and rail system re straints on the high-speed railway, the rail-bridge into an organic whole model is established by considering rail, track slab, friction between rail and fasteners, and bridge structure. The nonlinear time history analysis method is adopted to research the influnce of rail system restraint on elasto-plastic seismic response of piers for selected spans. The results show that the effect of rail system restraint on elasto-plastic seismic response of multi-span simply supported girder bridge with relatively great differences among the height of adjacent piers is significant, so it is adviced for the case that the rail-bridge into an organic whole model should be adopted in elasto-plastic seismic response analysis.