基底隔震桥墩振动台试验研究

发布时间：2018-03-17 18:47

本文选题：基底隔震　切入点：桥墩　出处：《兰州交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文采用振动台模型试验与有限元数值模拟相结合的方法,研究了三种基底摇摆隔震桥墩的地震反应。通过振动台试验结果和有限元数值模拟结果的对比分析,总结出三种基底隔震桥墩地震反应的变化规律,并验证已有数值计算模型的正确性,对基底隔震技术在桥梁抗震应用中的推广具有积极的现实意义。本文主要研究内容如下:(1)从理论研究、振动台试验和工程实际应用三个方面介绍了基底隔震技术的国内外研究现状,阐述了各国规范中基底隔震桥墩的设计和计算方法,并对典型减隔震装置的力学性能和常用桥梁减隔震的分析方法做了总结。(2)在研究了模型结构动力试验相似原理的基础上,以设计时速160km/h的客货共线24m简支T梁桥矩形桥墩为原型,设计制作了三组动力相似比为1:40的基底摇摆隔震桥墩模型,分别代表自由摇摆基底隔震桥墩、沿墩底两侧加台设置限位钢筋和沿墩柱中心设置预应力防倾覆钢筋的基底摇摆隔震桥墩。(3)通过振动台模型试验,分别测试三种模型在不同峰值加速度、不同类型地震波和不同轴压比作用下的加速度、位移和应力反应,并对数据结果进行了对比分析。(4)通过对三种模型地震反应的数据进行对比分析,研究了地震波峰值加速度、地震波类型和轴压比对三种基底隔震桥墩地震反应的影响。通过三种模型的比较,研究了限位耗能装置对模型桥墩摇摆反应和耗能机制的影响。在总结基底隔震桥墩地震反应变化规律的基础上,评价了三种结构抗震性能的优缺点。(5)采用考虑提离效应、碰撞效应、预应力效应和限位效应的基底摇摆隔震桥墩数值计算模型模拟了三种模型的地震反应。并将振动台试验结果与有限元数值模拟结果进行了对比分析,结果表明数值计算模型可很好地模拟基底摇摆隔震桥墩的地震反应,且模型地震反应变化规律与试验实测值变化规律一致,验证了数值计算模型的正确性。
[Abstract]:In this paper, the seismic response of three base rocking isolated bridge piers is studied by using the method of shaking table model test and finite element numerical simulation. The results of shaking table test and finite element numerical simulation are compared and analyzed. The variation laws of seismic response of three kinds of base-isolated bridge piers are summarized, and the correctness of the existing numerical calculation models is verified. It has positive practical significance for the application of base isolation technology in the application of earthquake resistance of bridges. The main contents of this paper are as follows: 1) from the theoretical perspective, This paper introduces the research status of base isolation technology in China and abroad from three aspects of shaking table test and practical application of engineering, and expounds the design and calculation methods of base isolation bridge pier in national codes. The mechanical properties of typical isolation devices and the analysis methods of common bridge isolation are summarized. Based on the study of the similarity principle of dynamic test of model structures, Based on the rectangular pier of a passenger / freight common-line 24m simply supported T-beam bridge designed at 160 km / h per hour, three sets of base rocking isolated pier models with a dynamic similarity ratio of 1:40 are designed and manufactured, respectively, representing the free rocking base isolation pier. The foundation rocking isolated bridge piers with limited reinforcement along both sides of pier bottom and prestressed anti-overturning steel bar set along the center of pier column are tested by shaking table model test, and the three models with different peak accelerations are tested respectively. The acceleration, displacement and stress responses of different types of seismic waves and different axial compression ratios are compared and analyzed. The peak acceleration of seismic waves is studied by comparing and analyzing the seismic response data of three kinds of models. Effects of seismic wave types and axial pressure ratios on seismic responses of three base-isolated piers. The influence of limited energy dissipation device on the rocking response and energy dissipation mechanism of model pier is studied. Based on the conclusion of the variation law of seismic response of base isolated bridge pier, the advantages and disadvantages of seismic performance of three kinds of structures are evaluated. The seismic responses of three kinds of models are simulated by the numerical calculation model of base rocking isolated bridge pier with impact effect, prestress effect and limit effect, and the results of shaking table test and finite element numerical simulation are compared and analyzed. The results show that the numerical model can well simulate the seismic response of the rocking isolated bridge pier, and the variation law of the model seismic response is consistent with the experimental measured value, which verifies the correctness of the numerical calculation model.
【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】：U446;U443.22

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