铁路摇摆隔震桥墩抗震性能试验研究

发布时间：2018-05-20 00:10

本文选题：摇摆隔震 + 拟静力试验　；参考：《兰州交通大学》2015年硕士论文

【摘要】：近年来,基底隔震技术因其潜在的良好的隔震性能成为国内外的研究热点。本文基于拟静力试验方法研究了铁路桩基础摇摆隔震桥墩的抗震性能,并采用Pushover分析方法对摇摆隔震桥墩进行了抗震性能分析。主要研究工作包含以下几个方面:(1)回顾了国内外抗震设计理念的发展,阐述了摇摆隔震设计的优越性;对国内外学者采用理论计算、试验研究、数值模拟等方法在摇摆隔震领域的取得的研究成果进行了总结,介绍了若干个已经将摇摆隔震理念应用于工程实践中的桥梁。(2)设计了三种桩基础摇摆隔震桥墩试验模型,分别为无约束自由摇摆模型、墩底和承台两侧设置限位钢筋的模型、在墩顶和承台底中心设置预应力防倾覆钢筋的模型。制订了摇摆隔震桥墩的拟静力试验方案,制作了试验模型并确定了加载制度与数据采集等方案。(3)对模型进行了拟静力试验,描述并分析了试验中观察到的现象。通过对试验数据的分析,获得了试验模型的滞回曲线、骨架曲线、耗能曲线、强度和刚度特性等抗震性能参数,对参数进行了分析,并对三种模型的试验数据进行了对比,对其抗震性能进行了比较,获得了一些有益的结论。(4)通过有限元分析软件对三种试验模型进行了数值模拟,并采用静力弹塑性Pushover方法对模型进行了抗震性能分析,获得了模型的骨架曲线、摇摆-提离特性、限位钢筋和防倾覆钢筋的弹塑性变形特性等参数。对三种有限元模型的分析结果进行了对比,总结了各模型摇摆隔震性能的优、缺点。(5)将Pushover分析得出的骨架曲线与拟静力试验获得的骨架曲线进行了对比,验证了摇摆隔震桥墩数值计算模型的可靠性。
[Abstract]:In recent years, the base isolation technology has become a research hotspot at home and abroad because of its potential good isolation performance. In this paper, the seismic behavior of rocking isolated pier of railway pile foundation is studied based on pseudo-static test method, and the seismic behavior of rocking isolated pier is analyzed by using Pushover analysis method. The main research work includes the following aspects: (1) reviewing the development of aseismic design concept at home and abroad, expounding the superiority of rocking isolation design, using theoretical calculation and experimental research to domestic and foreign scholars, The research results obtained by numerical simulation in the field of rocking isolation are summarized. Several bridges that have applied rocking isolation concept to engineering practice are introduced. Three test models of rocking isolated pier for pile foundation are designed. They are the unconstrained free swinging model, the model of limited reinforcement on the bottom of pier and both sides of cap, and the model of prestressed anti-overturning steel bar at the top of pier and the center of bottom of cap. The quasi-static test scheme of rocking isolated bridge pier is worked out, the test model is made and the loading system and data collection scheme are determined. The quasi-static test of the model is carried out, and the phenomena observed in the test are described and analyzed. By analyzing the test data, the hysteretic curve, skeleton curve, energy dissipation curve, strength and stiffness characteristics of the test model are obtained, and the parameters are analyzed, and the test data of the three models are compared. The seismic behavior of the model is compared, and some useful conclusions are obtained. The numerical simulation of the three test models is carried out by using the finite element analysis software, and the seismic behavior of the model is analyzed by using the static elastoplastic Pushover method. The parameters of the model, such as the skeleton curve, the rocking and lifting characteristics, the elastic-plastic deformation characteristics of the limited steel bar and the anti-overturning steel bar, are obtained. The analysis results of three finite element models are compared, and the advantages and disadvantages of each model are summarized. (5) the skeleton curve obtained by Pushover analysis is compared with the skeleton curve obtained by pseudostatic test. The reliability of the numerical model of rocking isolated bridge pier is verified.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

【参考文献】