双塔双索面斜拉桥地震动响应分析

发布时间：2018-02-09 22:00

本文关键词： 大跨度地震响应分析纤维模型非线性　出处：《青岛理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,伴随我国经济的蓬勃发展,大跨度斜拉桥凭借其新颖的构造、合理的受力形态及较强的跨越能力在道路交通工程中得到了广泛应用。大跨度斜拉桥作为一个地区的交通枢纽工程,往往对整个地区的经济发展具有很强的带动作用。因此,研究分析大跨度斜拉桥地震动作用下的响应问题,确保其在地震作用下的安全性是十分必要的。本文首先阐述了近现代阶段斜拉桥发展的历程和目前广泛使用的地震动响应分析方法;然后,以现有一座双塔双索面斜拉桥(钢筋预应力混凝土结构)为工程背景,通过大型有限元分析软件MIDAS/CIVIL建立了该桥的三维空间有限元模型,对其进行了自振特性和地震动响应的分析研究。研究如下:(1)本文首先阐述了大跨度斜拉桥的基本特点及国内外发展历程;探讨了大跨度斜拉桥地震动响应分析的必要性和当前斜拉桥地震动响应分析存在的一些问题。(2)阐述当前桥梁地震动响应分析的一些基本理论;主要分析了当前使用较为广泛的反应谱法和时程分析法,并给出了相应的计算公式。(3)以有限元软件MIDAS/CIVIL为计算分析平台,建立了工程实例的三维空间有限元模型,对该斜拉桥的自振周期、振型等结构特性进行了分析研究。(4)通过计算斜拉桥的有效振型参与质量,确定了参与反应谱法分析的振型模态阶数;同时按照相关规范并结合桥址所在场地条件,确定了结构的设计反应谱;进行了5种地震动工况输入下的反应谱法分析。(5)根据规范相关规定以及桥址的地震特性,选取合适的地震波作为地震动输入波;重点考虑了索塔的材料非线性对斜拉桥的地震动响应分析的影响,从而对斜拉桥进行了线性时程及借助索塔纤维模型的非线性时程一致激励下地震动响应分析。(6)通过对比分析反应谱法和时程分析法在各种工况下桥梁关键部位内力和位移响应的结果,得出相关结论。
[Abstract]:In recent years, with the vigorous economic development of our country, the long-span cable-stayed bridge with its novel structure, The reasonable force form and the strong span ability have been widely used in the road traffic engineering. The long-span cable-stayed bridge, as a traffic hub project in one area, often has a strong driving effect on the economic development of the whole area. The response of long-span cable-stayed bridges under ground motion is studied and analyzed. It is very necessary to ensure the safety of cable-stayed bridges under earthquake action. This paper first describes the development of cable-stayed bridges in modern times and the widely used seismic response analysis methods. Based on a two-tower and double-cable plane cable-stayed bridge (reinforced prestressed concrete structure), the three-dimensional finite element model of the bridge is established by the large-scale finite element analysis software MIDAS/CIVIL. The characteristics of the long-span cable-stayed bridge and the history of its development at home and abroad are discussed in this paper. This paper discusses the necessity of ground motion response analysis of long-span cable-stayed bridge and some problems existing in ground motion response analysis of cable-stayed bridge at present. This paper mainly analyzes the response spectrum method and time history analysis method which are widely used at present, and gives the corresponding calculation formula. (3) based on the finite element software MIDAS/CIVIL as the platform of calculation and analysis, the three-dimensional finite element model of engineering example is established. Based on the analysis of the structural characteristics of the cable-stayed bridge, such as the natural vibration period and the mode shape, the modal order of the cable-stayed bridge is determined by calculating the effective mode participation quality of the cable-stayed bridge. At the same time, according to the relevant codes and the site conditions of the bridge site, the design response spectrum of the structure is determined, and the response spectrum method under the input of five ground motion conditions is carried out to analyze the seismic characteristics of the bridge site according to the relevant regulations of the code and the seismic characteristics of the bridge site. The suitable seismic wave is chosen as the input wave of the ground motion, and the influence of the material nonlinearity of the cable tower on the seismic response analysis of the cable-stayed bridge is considered. Thus, the linear time-history of cable-stayed bridge and the analysis of ground motion response under nonlinear time-history uniform excitation with the help of cable tower fiber model are carried out. The response spectrum method and time-history analysis method are compared and analyzed in the key parts of the bridge under various working conditions. The results of the force and displacement response, Draw relevant conclusions.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27;U442.55

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