预应力节段拼装混凝土桥墩拟静力试验研究及数值分析

发布时间：2018-01-13 10:42

本文关键词：预应力节段拼装混凝土桥墩拟静力试验研究及数值分析　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着现代化施工技术对于快速施工、降低施工对既有交通影响、降低对周边生态环境冲击的要求，预制节段拼装技术为该问题提供了一条可供解决的途径，因此该技术越来越受到桥梁工程师和业主的青睐，并在世界范围内得到了广泛认可和应用。但是，对预应力节段拼装混凝土桥墩抗震性能的不确定性，限制了该项技术在高烈度地区的应用。随着我国桥梁建设逐步向高地震危险地区的发展，预应力节段拼装混凝土桥墩的抗震性能研究已经成为桥梁设计者和抗震学者研究的重点和热点。鉴于上述原因，本文结合国内外相关研究现状，通过拟静力试验对两种不同类型预应力节段拼装混凝土桥墩进行了抗震性能试验研究，并进行了数值模拟分析，旨在探究节段拼装预应力混凝土桥墩的地震破坏机理和有效的数值模拟方法。本文的主要工作如下述所示：首先，以广泛深入的文献调研为基础，，总结了国内外学者对不同类型预应力节段拼装混凝土桥墩抗震性能的试验研究方法和试验结论，回顾了各国学者对预应力节段拼装混凝土桥墩抗震性能的理论研究现状，阐述了在预应力节段拼装混凝土桥墩设计过程中的基本概念，以及不同设计方式对于预应力节段拼装混凝土桥墩抗震性能的影响。其次，为初步探究预应力节段拼装混凝土桥墩的抗震性能和破坏机理，设计了两组节段拼装混凝土桥墩，进行了拟静力试验研究。对桥墩在地震荷载作用下的滞回特性、刚度退化规律、延性性能、耗能能力及残余变形等参数进行分析，说明了预应力节段拼装混凝土桥墩的破坏机理，同时比较了普通自密实混凝土和钢纤维自密实混凝土对节段拼装桥墩抗震性能的影响。最后，采用OpenSees有限元分析软件中的纤维梁柱单元对预应力节段拼装混凝土桥墩进行了数值模拟分析，并对比试验结果验证其正确性，同时，对梁柱单元截面纤维划分方式对计算结果的精度进行了分析。
[Abstract]:With the modern construction technology for rapid construction, reduce the construction of existing traffic impact, reduce the impact on the surrounding ecological environment requirements, prefabricated segment assembly technology provides a way to solve this problem. Therefore, the technology has been more and more favored by bridge engineers and owners, and has been widely recognized and applied in the world. However, the seismic behavior of prestressed segmented concrete pier is uncertain. The application of this technology in high intensity areas is limited. With the development of bridge construction in China, it is gradually developed to high seismic risk areas. The study of seismic behavior of prestressed segmental assembled concrete pier has become the focus and focus of bridge designers and aseismic scholars. In view of the above reasons, this paper combines the domestic and foreign related research status. The aseismic behavior of two different types of prestressed segmental assembled concrete piers is studied by pseudo-static test and numerical simulation analysis is carried out. The purpose of this paper is to explore the seismic failure mechanism and effective numerical simulation method of segmented prestressed concrete piers. The main work of this paper is as follows: Firstly, based on extensive and in-depth literature research, the experimental research methods and experimental conclusions on seismic behavior of different types of prestressed segment assembled concrete pier are summarized by domestic and foreign scholars. This paper reviews the current situation of theoretical research on the seismic behavior of prestressed segmental assembled concrete piers, and expounds the basic concepts in the design process of prestressed segmental assembly concrete piers. And the influence of different design methods on seismic behavior of prestressed segmental assembled concrete pier. Secondly, in order to explore the seismic behavior and failure mechanism of prestressed segmental assembled concrete pier, two groups of segmental assembled concrete pier are designed. The hysteretic characteristics, stiffness degradation law, ductility performance, energy dissipation capacity and residual deformation of pier under earthquake load are analyzed. The failure mechanism of prestressed segmental assembled concrete pier is explained, and the influence of ordinary self-compacting concrete and steel fiber self-compacting concrete on seismic performance of segmental assembled concrete pier is compared. Finally, the fiber Liang Zhu element in the OpenSees finite element analysis software is used to simulate and analyze the prestressed segment assembled concrete pier, and the results are compared with the experimental results to verify its correctness. The accuracy of the calculation results was analyzed by the fiber division method of Liang Zhu unit section.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.22;U446

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