某矮塔斜拉桥动力特性及地震响应分析

发布时间：2018-07-04 22:45

本文选题：矮塔斜拉桥 + 反应谱分析　；参考：《重庆交通大学》2015年硕士论文

【摘要】：矮塔斜拉桥为近20年来出现的,是介于连续梁(刚构)桥与斜拉桥之间的一种新型桥梁。所以它的受力特性与梁桥和斜拉桥既有内在联系,又有本质区别。从整体上来说,连续梁桥一般由主梁直接承受弯剪作用来抵抗竖直方向的荷载作用力,斜拉桥一般由主梁受压和拉索受拉来抵抗竖直方向的荷载作用力,故此,主梁的受力大小和状态的差异是上述三种桥型的根本原因所在。综上所述,研究矮塔斜拉桥的本质在于研究梁的受力特性。本文依托一座双塔单索面矮塔斜拉桥——瑞丽江特大桥为工程背景,利用Midas civil 2013有限元分析软件,采用反应谱法和动态时程分析方法对瑞丽江特大桥进行了动力特性及地震响应分析。具体工作如下:①简述了矮塔斜拉桥的发展和桥梁震害的影响及启示②从理论上分析了矮塔斜拉桥有限元模型③瑞丽江特大桥动力特性分析④采用反应谱对瑞丽江特大桥进行分析,计算了纵桥向、横桥向和竖向及三向组合作用下桥梁结构地震响应分析。⑤采用动态时程对瑞丽江特大桥进行分析,利用埃尔森特罗波(ElCentro)、oakwh2波、和park040波进一步对比,以埃尔森特罗波(ElCentro)进行详细的在多遇地震作用下塔和主梁某些重要截面的时程曲线图和地震响应分析。并进一步研究多激励作用下的行波效应。
[Abstract]:Low tower cable-stayed bridge is a new type of bridge between continuous beam (rigid frame) bridge and cable-stayed bridge. Therefore, its mechanical characteristics and girder bridge and cable-stayed bridge have both internal relations and essential differences. On the whole, continuous beam bridges are generally subjected to bending and shearing directly by the main girder to resist vertical loads, while cable-stayed bridges are generally subjected to the compression of the main girder and the tension of cables to resist the vertical loads, so, The difference of the force and state of the main beam is the root cause of the above three bridge types. To sum up, the essence of studying the low tower cable-stayed bridge is to study the mechanical characteristics of the beam. Based on the engineering background of a cable-stayed bridge with two towers and single cable plane, Ruilijiang super bridge, this paper uses Midas civil 2013 finite element analysis software. The dynamic characteristics and seismic response of Ruilijiang Bridge are analyzed by using response spectrum method and dynamic time history analysis method. The concrete work is as follows: 1. The development of the cable-stayed bridge with low tower and the influence of the bridge damage and its inspiration are briefly described. 2. The finite element model of the cable-stayed bridge with low tower is analyzed theoretically, and the dynamic characteristics of the super bridge of Ruilijiang are analyzed. 4 the response spectrum is applied to the Rayleigh bridge. For the analysis of the River Bridge, Seismic response Analysis of Bridge structures under Longitudinal, Transverse and Vertical and Triaxial combined actions .5 dynamic time history is used to analyze the Ruilijiang super bridge, and further comparison between the park040 wave and the El Centro wave is used to analyze the seismic response of the bridge structure under the combined action of the longitudinal, transverse and vertical directions, and the dynamic time history is used to analyze the seismic response of the bridge structure under the combined action of the longitudinal, transverse and vertical directions. The time-history curve and seismic response analysis of some important sections of tower and main beam under frequent earthquake are carried out by El Centro. Furthermore, the traveling wave effect under multiple excitations is studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.27

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