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双柱式高墩桥梁地震响应结构参数影响分析

Keywords: 桥梁工程,双柱式高墩桥,地震响应,反应谱,参数分析,地形条件

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Abstract:

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。

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