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动水压力与波浪效应对隔震桥梁地震反应的影响分析

DOI: 10.13197/j.eeev.2014.06.42.xianql.006, PP. 42-50

Keywords: 隔震桥梁,动水压力,波浪效应,地震反应

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Abstract:

基于辐射波浪理论和Morison方程分别求解地震动水压力和波浪效应对桥墩的作用,建立了能够同时考虑动水压力和波浪作用的桥梁动力平衡方程;利用Sap2000软件建立非隔震和隔震两种全桥结构有限元模型,考虑地震、地震与动水压力共同作用、地震与动水压力及波浪共同作用三种工况,分别输入七条地震动进行分析,取最大值的平均值来进行比较和分析,研究动水压力和波浪效应对桥梁地震反应的影响.研究表明动水压力改变了桥梁的动力特性,增大了桥梁的地震反应;波浪效应对桥梁地震反应的影响比动水压力的影响小,对隔震桥梁的地震反应影响几乎可以忽略,对非隔震桥梁影响较大.三种工况下,隔震桥梁的地震反应均小于非隔震桥梁的地震反应.

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