大跨度高低墩斜拉桥地震响应特性研究

发布时间：2018-04-21 17:35

本文选题：斜拉桥 + 高低墩　；参考：《西南交通大学》2015年硕士论文

【摘要】：万州长江三桥为主跨730m的双塔混合梁斜拉桥。该桥南、北塔的下塔墩高度差异较大,其中北塔的下塔墩高度13.70m,南塔的下塔墩高度53.62m,因此桥梁结构存在着较大的非对称性。本文以万州长江三桥为工程背景,研究了该类高低墩斜拉桥的地震响应特性,本文具体内容如下：(1)综述了斜拉桥的发展概况和抗震分析研究现状,探讨了目前大跨度斜拉桥地震响应分析研究的不足。(2)总结了桥梁地震反应分析的一些常用方法,包括静力法、反应谱法、动态时程分析法和功率谱法,讨论了以上分析方法的适用范围及优缺点。(3)详述了万州长江三桥的有限元建模过程,分析了该桥的自振特性,讨论了桩-土-结构相互作用对斜拉桥自振特性的影响。(4)采用反应谱方法,对万州长江三桥地震响应进行了计算分析,探讨了南、北桥塔地震响应的规律；研究了桩-土-结构相互作用对斜拉桥地震响应的影响；讨论了高低墩斜拉桥在裸塔施工阶段的地震响应规律。(5)采用时程方法,计算分析了一致激励和多点激励下万州长江三桥的地震响应,比较了南、北桥塔地震响应的异同点,并研究了行波效应对大跨度斜拉桥地震响应的影响。
[Abstract]:Wanzhou Yangtze River Bridge is a 730m-span cable-stayed bridge with two-tower hybrid beams. In the south and north of the bridge, the height of the lower tower pier varies greatly, among which the lower tower pier height of the north tower is 13.70 m, and the lower tower pier height of the south tower is 53.62 m, so the bridge structure has a large asymmetry. In this paper, the seismic response characteristics of this kind of cable-stayed bridge with high and low piers are studied with Wanzhou Yangtze River Bridge as the engineering background. The main contents of this paper are as follows: 1) the development and seismic analysis of cable-stayed bridge are summarized. The deficiency of seismic response analysis of long-span cable-stayed bridges at present is discussed. Some common methods for seismic response analysis of bridges are summarized, including static method, response spectrum method, dynamic time-history analysis method and power spectrum method. The application of the above analysis method and its advantages and disadvantages are discussed. The finite element modeling process of Wanzhou Yangtze River third Bridge is described in detail, and the natural vibration characteristics of the bridge are analyzed. The influence of pile-soil-structure interaction on the natural vibration characteristics of cable-stayed bridge is discussed. The response spectrum method is used to calculate and analyze the seismic response of Wanzhou Yangtze River third Bridge. The influence of pile-soil-structure interaction on the seismic response of cable-stayed bridge is studied, and the seismic response law of cable-stayed bridge with high and low piers in the construction stage of bare tower is discussed. The seismic responses of Wanzhou Yangtze River Bridge under uniform excitation and multi-point excitation are calculated and analyzed. The similarities and differences of seismic responses of the towers of the north and south bridges are compared, and the effect of traveling wave effect on the seismic response of long-span cable-stayed bridges is studied.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27;U442.55

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