大跨度混合梁斜拉桥地震响应分析及阻尼器参数优化

发布时间：2018-03-27 07:12

本文选题：混合梁斜拉桥　切入点：地震响应　出处：《西南交通大学》2017年硕士论文

【摘要】：论文以主跨跨径为530m的某大跨度混合梁斜拉桥为研究对象,其主跨主梁为钢混叠合梁。运用有限元方法建立了该桥的全桥空间有限元模型,研究分析了大跨度斜拉桥结构的动力特性以及地震响应特征,主要包括以下几点内容:(1)简述了混合梁斜拉桥的特点和发展过程,并介绍了一些常见的桥梁震害特点及原因;(2)论述了三种常用的桥梁地震反应分析方法,包括静力法、反应谱法以及动态时程分析方法,并讨论了各自的适用范围和优缺点;(3)详述了该斜拉桥空间有限元模型的建立过程,计算了该大跨度斜拉桥的有桩基础模型和无桩基础模型的自振频率和振型,对比分析了桩-土-结构相互作用对结构自振特性的影响;(4)运用时程分析方法计算了该大跨度斜拉桥有桩基础模型和无桩基础模型的地震响应,通过对比分析研究了桩-土-结构相互作用对大跨度斜拉桥地震响应的影响规律;(5)运用多点激励的方法研究了行波效应对大跨度斜拉桥地震相应的影响规律,与一致激励的结果进行对比,比较两者差异,并且研究了5种地震波波速工况下的主塔塔顶和主梁梁端纵向位移、塔底内力的变化规律;(6)运用非线性时程分析方法,研究了纵向粘滞阻尼器不同的参数组合对于该大跨度斜拉桥的地震响应的影响规律和减震效果,并对阻尼器的阻尼系数和阻尼指数进行优化,提出了一组适合该斜拉桥的粘滞阻尼器参数。
[Abstract]:In this paper, a large span cable-stayed bridge with 530m span is studied, and the main span of the bridge is steel-concrete composite beam. The spatial finite element model of the bridge is established by using finite element method. The dynamic characteristics and seismic response characteristics of long-span cable-stayed bridge structures are studied and analyzed. The main contents are as follows: 1) the characteristics and development process of hybrid cable-stayed bridges are briefly described. This paper also introduces some common characteristics and causes of bridge earthquake damage, and discusses three commonly used bridge seismic response analysis methods, including static method, response spectrum method and dynamic time-history analysis method. The establishment process of the spatial finite element model of the cable-stayed bridge is discussed in detail, and the natural frequencies and modes of the pile-foundation model and the pile-free foundation model of the long-span cable-stayed bridge are calculated. The influence of pile-soil-structure interaction on the natural vibration characteristics of the structure is analyzed. (4) the seismic responses of the long-span cable-stayed bridge model with and without pile foundation are calculated by using time-history analysis method. The effect of pile-soil-structure interaction on the seismic response of long-span cable-stayed bridges is studied by means of comparative analysis. (5) the effect of traveling wave effect on the seismic response of long-span cable-stayed bridges is studied by using the method of multi-point excitation. Compared with the results of consistent excitation, the difference between them is compared, and the longitudinal displacement of the top of the main tower and the beam end of the main girder under five seismic wave velocities are studied. The variation law of the internal forces at the bottom of the tower is studied by means of nonlinear time-history analysis method. The effects of different parameter combinations of longitudinal viscous dampers on the seismic response of the long-span cable-stayed bridge are studied, and the damping coefficient and damping index of the dampers are optimized. A set of viscous damper parameters suitable for the cable-stayed bridge is proposed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U448.27;U442.55

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