马桑溪桥动力特性及地震响应分析-桥梁与隧道工程专业毕业论文.docxVIP

西南交通大学硕士研究生学位论文 西南交通大学硕士研究生学位论文 第l页 摘要 在国内外有关研究成果的基础上，利用ANSYS结构分析程序，采用谱分析 和动态时程分析两种方法对马桑溪长江大桥进行了地震响应计算，得到了该桥的 地震反应规律。 马桑溪长江大桥是一座双塔双索面混凝土斜拉桥，桥长718m，主跨360m， 桥位处于地震烈度6度区．首先利用ANSYS程序建立了该桥的动力计算模型， 通过模态分析得到该桥的动力特性。 采用标准反应谱作为输入的谱曲线，分别考虑了纵向，横向、竖向以及顺桥 向+竖向、横桥向+竖向组合输入，得到该桥的地震响应。 谱分析是一种线性分析，无法考虑非线性的影响，因此又进行了动态时程分 析，这种分析方法可以考虑～些非线性因素的影响。 利用E1．Centro波对马桑溪大桥进行了一致激励和行波激励的数值模拟。 最后，比较了塔的型式和斜拉索的型式对马桑溪大桥动力特性的影响。 关键词：斜拉桥，地震响应，反应谱，时域分析，ANSYS，行波效应 西南交通大学硕士研究生学位论文 西南交通大学硕士研究生学位论文 第Ⅱ页 Abstract On the basis of research results inside and outsi血of china，using stmctura| analysis program ANSYS，adopting spectrum analysis and time-hismry analysis methods，this thesis made a seismic response analysis of Masangxi Yangtze River Bridge．And then，seismic response law of the bridgc was obtained． Masangxi Yangtze River Bridge is a concrete bridge with double tower and double cable plane．11把total span is 718m and main span 360m．nc bridge whose location is important is situated on the field of 6 degree earthquake intensity． First,the model for calculmion was made by using ANSYS program．Then，mode analysis was made to obtain behaviour of the bridge．Second,the standard seismic response spec恤lm is inputted from longitudinal,transverse and vertical direction respectively．Two kinds of seismic combinational modes．which a此long／mdina／plus vertical vibration and transverse plus veaical vibration are considered．And then， seismic response of the bridge Was obtained． Spectrum analysis is a linear analysis which啪not consider nonlinear effect．So， dynamic time-history analysis which can take some nonlinear effects into consideration was made． nc numerical simulation for the seismic responses of the bridge is performed under the uniform excitation and the traveling wave excitation Of El·Centro wave． Finally,comparison for dynamic behaviour influence of the bridge with different tower shape and cable style Was made． Keywords：cable-stayed bridge，seismic response，seismic response spectrum， time-domain analysis，traveling