城市曲线高架桥振动台试验与地震反应分析

发布时间：2018-04-04 21:48

本文选题：振动台试验　切入点：曲线桥　出处：《西安建筑科技大学》2014年硕士论文

【摘要】：城市曲线高架桥，结构线性型顺畅，可以更好的解决桥梁之间以及桥梁交通与地面交通之间的相互连接问题，从而起到解决或缓和交通困难的问题。近年来由于地震发生频繁，城市高架桥是人们高度依赖的生命线工程，发生地震时一旦受到破坏，将会产生巨大的损失。因此对高架桥的抗震研究有着重要的意义，尤其是曲线高架桥比较复杂，目前对曲线桥的研究理论比较缺乏，有待于更进一步的深入研究。本文分析了当前曲线高架桥研究的背景及意义，探讨了桥梁结构地震破坏的主要形式，包括桥梁上部结构、桥梁支座及下部结构等具体破坏形式。讨论了现行桥梁抗震设防标准、曲线桥的结构功能特点、国内外曲线桥梁抗震的研究现状以及桥梁抗震设计方法。结合国家自然科学基金项目，设计制作了曲线高架桥实体模型,进行了地震模拟振动台试验分析。具体阐述了振动台试验前期准备及试验相关过程，包括模型制作、拾振器及应变片布置等，并对试验数据进行分析处理，研究分析曲线结构桥的动力特性和抗震性能。本文利用大型有限元软件MIDAS FEA建立实体单元计算模型，利用时程分析法对“C”形曲线高架桥计算模型进行分析，讨论了模型在不同地震动输入下的地震反应，并与振动台试验模型进行比较，验证了实体模型与有限元模型模拟的准确性。对“人”字形曲线高架桥分别采用反应谱法和时程分析法两种方法分析，讨论其地震反应规律，并对两种方法得出的结果进行比较，，可作为振动台试验前的仿真分析参考。通过对“人”字形曲线高架桥进行不同角度地震动输入，比较分析了变截面异型梁、直线梁及曲线梁不同形式梁的抗震性能，探讨了“人”字形曲线高架桥最不利地震动反应。
[Abstract]:The urban curved viaduct has a smooth linear structure, which can solve the problem of the connection between the bridges and the bridge traffic and the ground traffic, so as to solve or ease the problem of traffic difficulties.Due to frequent earthquakes in recent years, urban viaducts are highly dependent lifeline projects, once the earthquake is damaged, it will cause huge losses.Therefore, the seismic research of viaduct is of great significance, especially the curved viaduct is more complicated.In this paper, the background and significance of the current research on curved viaduct are analyzed, and the main forms of seismic damage of bridge structure are discussed, including the concrete failure forms of bridge superstructure, bridge support and substructure, etc.The current seismic fortification standards of bridges, the structural features of curved bridges, the current research situation of seismic resistance of curved bridges at home and abroad and the seismic design methods of bridges are discussed.The solid model of the curved viaduct is designed and manufactured with the project of National Natural Science Foundation of China, and the shaking table test analysis of seismic simulation is carried out.The preparation of shaking table test and the related process of test, including model making, vibration pick-up and strain gauge arrangement, are described in detail. The test data are analyzed and processed, and the dynamic characteristics and seismic performance of curved structural bridge are studied and analyzed.In this paper, the calculation model of solid element is established by using the finite element software MIDAS FEA, and the calculation model of "C" curve viaduct is analyzed by time history analysis, and the seismic response of the model under different ground motion input is discussed.Compared with the shaking table test model, the accuracy of the solid model and the finite element model is verified.The response spectrum method and time history analysis method are used to analyze the viaduct of the "man" zigzag curve respectively. The seismic response law of the viaduct is discussed, and the results obtained by the two methods are compared, which can be used as a reference for the simulation analysis before shaking table test.Through the input of ground motion at different angles to the "man" curved viaduct, the seismic behavior of the different types of beams with variable cross-section, linear beam and curved beam is compared and analyzed, and the most unfavorable ground motion response of the "man" curve viaduct is discussed.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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