【作者】 申选召；

【导师】 林均岐；

【作者基本信息】 中国地震局工程力学研究所 ， 防灾减灾工程及防护工程， 2006， 硕士

【摘要】 大跨度斜拉桥一般都是交通运输的枢纽工程,一旦在地震中遭到破坏,将会造成巨大的直接和间接经济损失。因此,对斜拉桥进行正确有效的抗震设计,确保其抗震安全性具有非常重要的意义。本文对斜拉桥的建模方法、非线性因素及其分析方法进行了探讨,以某单索面混凝土斜拉桥为实例,对其动力特性及地震反应分析进行了研究。主要研究内容有:1、对桥梁震害及其原因进行了论述,总结了桥梁结构抗震设计方法的发展和变化。对斜拉桥地震反应分析中的建模、地震动输入,非线性时程分析的现状和存在的问题进行了系统的介绍。2、对地震运动方程的建立及其数值求解方法,时程分析中的地震动输入,阻尼问题及大跨度斜拉桥的非线性问题及其分析方法等进行了论述。3、对斜拉桥的建模方法进行了研究,并在此基础上,用MIDAS/Civil建立了某单索面混凝土斜拉桥的三维有限元分析模型,对其动力特性进行分析,对纵向弹性约束对振型的影响进行了比较。4、以El Centro波、Taft波和天津波作为地震动输入,对斜拉桥的地震反应进行了数值分析,对不同地震记录输入的反应、弹性反应和弹塑性反应分别进行了对比研究。本文的工作取得一些初步的研究成果,可为大跨斜拉桥抗震设计等提供参考。更多还原

【Abstract】 Long span cable-stayed bridges generally are the key structures of transportation system. Great direct and indirect economic loss will be caused if these bridges get damaged in an earthquake. Therefore the correct and effective earthquake resistance design and assurance of earthquake safety of cable-stayed bridges are of great importance. The finite element modeling methods and nonlinearities of cable-stayed bridges are discussed in this paper, and the dynamic characteristic and seismic response are carried out based on a concrete cable-stayed bridge with single cable plane. The main research work includes:1. The seismic damage and the reasons of bridges in earthquakes are discussed, the development and changes of bridge earthquake resistance design are reviewed, the state-of-the-art of finite element modeling, input of ground motion, and time history analysis of cable-stayed bridges are systematically introduced.2. The dynamic equations and the numerical analysis methods, the input of ground motion in time history analysis, the determination of damping ration, and the geometric nonlinearity and material nonlinearity of cable-stayed bridges are discussed in detail.3. The modeling method of cable-stayed bridges is studied, and the 3-D finite element analysis model of a concrete cable-stayed bridge is established using the MIDAS/Civil program. The dynamic characteristics of the bridge and the influence of different longitude constraints to the dynamic characteristics are studied.4. The seismic response analysis is conducted to the cable-stayed bridge with El Centro, Taft and Tianjin earthquake records. The seismic responses with different earthquake input and the linear and nonlinear response are studied. Some conclusions are obtained in this thesis, and can be referenced in the seismic design of long span cable-stayed bridges.更多还原