Seismic response of bridges supported on shallow rock foundations considering SSI and pier column inelasticity
Seismic response of bridges supported on shallow rock foundations considering SSI and pier column inelasticity
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考虑SSI和桥墩柱非弹性的浅岩地基桥梁地震响应
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Chaudhary
中科院分区：
文献类型：
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作者：
M. Chaudhary
传统上，浅扩展式基础用于支撑在岩层上的中等跨度桥梁。此类桥梁采用固定支座建模，不考虑土-结构相互作用（SSI）。本文介绍的调查采用了子结构技术和有限元法（FEM）模型的中跨4跨桥梁设计的五个不同的岩石类，并受到实际地面运动的合奏。钢筋混凝土墩柱的非线性行为被建模为材料和几何非线性，并通过等效线性模型纳入整体分析方案，而SSI通过Winkler弹簧。研究的结果进行了评估，以描绘的SSI和墩柱非线性的地震反应参数的桥梁建立在岩石地层中的浅基础的影响。结果发现，SSI不能被忽略的岩石类和输入地震动的所有情况下。墩柱非线性对桥梁位移和基底剪力的影响远大于SSI效应，在此类桥梁的抗震建模和分析中不应忽略。
Traditionally, shallow spread footing type foundations are used for medium span bridges supported on rock strata. Such bridges are modeled with fixed supports and no Soil-Structure Interaction (SSI) is considered. The investigation presented herein utilized a substructuring technique and Finite Element Method (FEM) model for a medium span 4-span bridge designed for five different rock classes and subjected to an ensemble of actual ground motions. Non-linear behavior of reinforced concrete pier column was modeled for material and geometric non-linearity and incorporated in the overall analysis scheme by equivalent linear model while SSI was included through Winkler springs. The results of the study were evaluated to delineate the effect of SSI and pier column non-linearity on seismic response parameters of bridges founded on shallow foundations in rock strata. It was found that the SSI cannot be neglected in all cases of rock classes and input ground motions. Furthermore, pier column non-linearity influenced bridge displacement and base shear much more significantly than SSI and should not be ignored in the seismic modeling and analysis of these bridges.