后张预应力预制拼装式空心桥墩抗震性能研究

发布时间：2018-04-06 20:14

本文选题：节段拼装桥墩　切入点：空心截面　出处：《石家庄铁道大学》2014年硕士论文

【摘要】：预制拼装式桥墩已被证明是加快桥梁建设和减少交通阻断的有效方法，然而，由于缺乏对预制拼装式桥墩在高地震危险区抗震性能的认知，限制了该种体系的广泛应用。本文的主要目的是：研究无粘结后张预应力预制拼装式空心桥墩在地震荷载作用下的抗震性能。本文是在河北省自然科学基金项目“后张预应力预制拼装式空心桥墩抗震性能研究”资助下进行的，所做的主要工作有： (1)在查阅大量国内外文献的基础上，对预制拼装式桥墩的应用现状和前景、类型及力学特征、试验和理论研究等进行了系统回顾与总结。 (2)设计了四个大比例尺空心桥墩模型，包括1个整体式钢筋混凝土空心桥墩，1个整体式预应力空心桥墩和2个预制拼装式空心桥墩，通过对这四个空心桥墩的拟静力试验，得到了各空心桥墩的破坏模式、滞回曲线、骨架曲线、残余位移、曲率分布、累积滞回耗能、等效粘滞阻尼系数以及预制拼装式桥墩接缝的张开情况，并且比较了整体式钢筋混凝土、整体式预应力空心桥墩和预制拼装式空心桥墩在拟静力作用下抗震性能的异同点。 (3)基于OpenSees有限元软件建立了纤维单元有限元模型，模拟结果和试验结果吻合度较高，说明建立的模型能正确反映桥墩的抗震性能。然后运用所建模型对桥墩进行拟静力作用下的设计参数分析，设计参数包括：恒载轴压比、纵筋配筋率、预应力筋配筋率、初始预应力大小、预应力筋布置位置、耗能钢筋配筋率、耗能钢筋长度，节段布置方式等。 (4)运用有限元模型对空心桥墩进行动力时程分析，，研究地震动作用下空心桥墩的抗震性能，并对预制拼装式空心桥墩进行了动力参数分析。
[Abstract]:Prefabricated piers have been proved to be an effective method to speed up the construction of bridges and reduce traffic interruption. However, due to the lack of understanding of the seismic performance of prefabricated piers in high seismic risk areas, the wide application of this system is limited.The main purpose of this paper is to study the seismic behavior of prefabricated prefabricated hollow piers with unbonded post-tensioned prefabricated hollow piers under seismic loads.This paper is supported by Hebei Province Natural Science Foundation project, "study on Seismic behavior of Post-tensioned Prestressed prefabricated Hollow Piers". The main work is as follows:On the basis of consulting a large number of literatures at home and abroad, this paper systematically reviews and summarizes the application status and prospect, types and mechanical characteristics, tests and theoretical studies of prefabricated assembled piers.Four large scale hollow pier models are designed, including one integral reinforced concrete hollow pier, one integral prestressed hollow pier and two prefabricated assembled hollow piers.The failure mode, hysteretic curve, skeleton curve, residual displacement, curvature distribution, cumulative hysteretic energy dissipation, equivalent viscous damping coefficient and the opening of joints of prefabricated piers are obtained.The seismic behavior of integral reinforced concrete, monolithic prestressed hollow pier and prefabricated hollow pier under quasi-static force is compared.3) the fiber element finite element model is established based on the OpenSees finite element software. The simulation results are in good agreement with the experimental results, which shows that the model can accurately reflect the seismic behavior of the pier.Then the model is used to analyze the design parameters of piers under quasi-static force. The design parameters include: dead load axial compression ratio, longitudinal reinforcement ratio, prestressing reinforcement ratio, initial prestress size, position of prestressing tendons,Ratio of reinforcement, length of energy-consuming steel bar, section arrangement and so on.The finite element model is used to analyze the dynamic time history of hollow piers, and the seismic behavior of hollow piers under ground motion is studied, and the dynamic parameters of prefabricated hollow piers are analyzed.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.22;U442.55

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