连续梁桥纵向减隔震分析

发布时间：2018-05-30 19:20

本文选题：铅芯橡胶支座 + 时程分析　；参考：《吉林建筑大学》2014年硕士论文

【摘要】：桥梁是跨越河流、湖泊和其他障碍的架空构造物，用以保证公路、城市道路、铁路等的畅通。作为生命线工程，一旦在地震中发生破坏将会给人们的生命财产造成巨大的损失。因此，对桥梁减隔震性能的研究具有十分重要的意义，通过在桥梁结构上设置减隔震支座和耗能装置，从而来增加其抗震性能。本文首先介绍了桥梁震害、设防标准，以及常用的减隔震支座，进而阐述了桥梁地震响应分析的基本理论，在此基础上，本文以某实桥为工程实例，采用有限元软件Midas建立了有限元模型并进行动力时程分析，研究其在地震中的动力响应规律。本文的研究内容主要包括： 1.依据动力学理论，应用有限元软件，建立了桥梁的有限元计算模型。 2.对三跨连续梁桥分别采用球型钢支座、板式橡胶支座以及铅芯橡胶支座，并用非线性时程分析法计算该桥在三种地震波作用下的地震响应 3.为了研究铅芯橡胶支座的减震性能，基于空间有限元模型，通过大量计算，从桥梁在三种支座下的地震响应来对比桥梁减震的差异，，并计算出其减震率，通过减震率的大小来判断支座的减震效果。
[Abstract]:Bridges are overhead structures that span rivers, lakes, and other obstacles to ensure the smooth passage of roads, urban roads, railways, etc. As a lifeline project, once damage occurs in earthquake, it will cause huge loss of life and property. Therefore, it is of great significance to study the seismic isolation performance of bridges. In order to increase the seismic performance of bridges, isolation bearings and energy dissipation devices are installed on the bridge structure. This paper first introduces the earthquake damage of bridge, the standard of fortification, and the commonly used isolator, and then expounds the basic theory of seismic response analysis of bridge. On the basis of this, a real bridge is taken as an engineering example in this paper. The finite element model is established by using the finite element software Midas and the dynamic time history analysis is carried out to study its dynamic response law in earthquake. The main contents of this paper are as follows: 1. According to the theory of dynamics, the finite element model of bridge is established by using finite element software. 2. Three span continuous beam bridges are supported by ball steel, plate rubber and lead rubber respectively. The seismic response of the bridge under three kinds of seismic waves is calculated by nonlinear time-history analysis method. 3. In order to study the vibration absorption performance of lead rubber bearing, based on the spatial finite element model, through a large number of calculations, the difference of the seismic response of the bridge under the three supports is compared, and the damping rate of the bridge is calculated. The shock absorption effect of the bearing is judged by the magnitude of the damping rate.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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