多点多维地震激励下大型渡槽非线性地震响应研究  

Nonlinear Seismic Response Study of the Large-scale Aqueduct under Multi-support and Multi-dimensional Earthquake Excitations

作　　者：雷永勤[1,2] 杜永峰[1,2] 

机构地区：[1]西部土木工程防灾减震研究中心,甘肃兰州730050 [2]兰州理工大学防震减震研究所,甘肃兰州730050

出　　处：《工程抗震与加固改造》2014年第3期42-48,共7页Earthquake Resistant Engineering and Retrofitting

摘　　要：针对超长渡槽结构,研究了地震地面运动多点激励下超长渡槽结构地震响应变化规律。首先,利用三角级数法生成了拟合规范反应谱的多点人工地震动时程,然后建立超长渡槽结构的三维有限元模型,利用非线性时程分析法研究了该超长渡槽结构在一致激励、仅考虑地震动行波效应和同时考虑行波与部分相干3种工况下的地震响应规律。分析结果表明:行波效应和相干效应对超长隔震渡槽结构有一定的影响,多点激励时地震响应总体大于一致激励时的地震响应,对大型渡槽进行地震响应分析时应考虑地震波空间效应的影响。The changing rules of seismic response for the large-scale aqueduct structure under multi-support and multi-dimensional earthquake excitations are studied. Firstly, the multi-support artificial ground motion is generated by using spectral representation method according to code response spectrum. Then three-dimensional finite element model of a large-scale aqueduct structure is build, and its response under multi-support and multi-dimensional earthquake excitations is studied by nonlinear time history analysis at the cases of uniform excitation, non-uniform excitation considering only wave passage effect and non-uniform excitation considering both the wave passage effect and incoherence effect. The results show that the wave passage effect and incoherent effect have obvious effects on the response of large-scale aqueduct. Generally, the response of large-scale aqueduct under spatial ground motion excitation is larger than that under uniform excitation. Therefore, spatial effect of ground motion should be considered in process of seismic analysis for large-scale aqueducts.

关 键 词：大型渡槽 地震响应 多点激励 非线性分析 

分 类 号：TV672.3[水利工程—水利水电工程] TV312