【摘要】 文中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、轨道板以及桥梁结构的线桥一体化模型,采用反应谱法研究了轨道约束系统以及相邻后继结构对所选桥跨地震反应的影响。研究结果表明:轨道约束系统对相邻墩高相差较大的多跨简支梁桥的地震反应影响较大,因此对其地震反应分析时应采用线桥一体化模型;由于受端刺等路桥过渡段结构纵向刚度的影响,后继结构的桥梁跨数越少,对边墩地震反应的卸载作用越显著。更多还原

【Abstract】 Based on properties of multi-span simply supported girder bridges and rail system restraints in the high-speed railway,a rail-bridge model is established by considering rail,track slab and bridge structure.Elastic response spectra are adopted to research the influnce of rail system restraints and the succeeding-structure on seismic response for selected bridge spans.The results show that the effect of rail system restraints on seismic response for the multi-span simply supported girder bridge with relatively great difference height of adjacent piers is significant,so the rail-bridge model for the case should be adopted in earthquake response analysis.Due to the effect of longitudinal stiffness of the railway and bridge transitional section such as terminal spine,the unloading effect on the seismic response of the side piers is more significant if the number of the succeeding-structure spans is fewer.更多还原