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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。
Taking the double-column high-pier bridge commonly used in expressway in southwest mountainous area as the research object, a space dynamic analysis model considering the coupling between the support and the upper and lower structures was established. Through a great deal of analysis and calculation, the pier height variation, , Single and multi-link model, single cross-link, single link and single pier model, as well as topographical conditions and other parameters of the impact of the earthquake response to the extent and laws. The results show that the simplified consolidation model can be applied to the conventional design. The single-joint model can be used for longitudinal seismic response analysis. For the horizontal seismic response analysis, the multi-joint model should be adopted. The single span model has less influence on the calculation results. The results of longitudinal seismic response calculation using single pier model are generally unsafe. Different topographic conditions have a great influence on the seismic effect of bridge piers.