【摘要】 以西南山区高速公路常用的双柱式高墩桥梁为研究对象,建立了考虑支座与上下部结构耦联的空间动力分析模型,通过大量分析计算,分别详细讨论了墩高变化、桩土作用、单联与多联模型、单联不同跨数、单联与单墩模型以及地形条件等参数对地震响应结果的影响程度与规律。结果表明:桩底简化固结模型可以适用于常规设计;单联模型可用于纵向地震反应分析,而对于横向地震反应分析宜采用多联模型;单联不同跨数模型对计算结果影响较小;采用单墩模型进行纵向地震反应计算的结果总体上偏于不安全;不同地形条件对桥墩的地震作用影响较大。更多还原

【Abstract】 In order to research double-column highway bridge with high piers in southwest mountain area,the spatial dynamic model considering the coupling of bearings,superstructures and substructures was established.The effects of some structural parameters on bridge seismic responses were studied in detail respectively.These parameters include height of piers,pile-soil interaction,single-segment and multi-segments models,single-segment model with different span numbers,single-segment and single-pier model,and terrain conditions.The results show that(1) the simply fixed pile bottom model can be used for conventional design;(2) the single-segment model can be used for longitudinal seismic response analysis,while multi-segments model should be adopted for transversal seismic response analysis;(3) the single-segment model with different span numbers has negligible influence on analysis results;(4) the results of longitudinal seismic response analysis using single-pier model generally tend to be unsafe;(5) different terrain conditions have great influence on seismic response of piers.更多还原