配竖向预应力钢筋的自复位隔震桥墩抗震性能研究

发布时间：2018-05-10 06:11

本文选题：自复位 + 摇摆隔震　；参考：《兰州交通大学》2015年硕士论文

【摘要】：自复位隔震桥墩在墩底和基础的接触面处分离,在罕遇地震下,可以发生摇摆,隔离了部分地震能量的传递,起到保护桥墩和基础的作用,震后依靠自重进行自复位。目前预应力技术在自复位隔震桥墩中还鲜有研究。本文采用数值分析方法,研究了配竖向预应力钢筋自复位隔震桥墩的抗震性能,主要研究内容如下:(1)通过查阅文献资料,总结了自复位摇摆结构的发展与应用及其国内外研究现状。(2)介绍了减隔震的基本原理以及减隔震结构地震反应的分析方法。(3)介绍了自复位隔震桥墩的几种分析模型,在两弹簧模型的基础上,提出了配竖向预应力钢筋的自复位隔震桥墩模型。(4)以某新建铁路特大桥为背景,建立单墩分析模型,采用非线性时程分析法,研究了两弹簧模型和竖向配预应力钢筋模型在有、无预应力的三种情况下的地震反应并进行了对比,结果表明,在原有结构上施加了预应力后,自复位震桥墩的抗震性能有明显改善。(5)研究了影响桥墩隔震性能的预应力因素,通过改变这些因素,进行了参数比对分析,结果表明,预应力的大小对桥墩地震反应的影响较大,适当大小的预应力能较好地改善自复位隔震桥墩的抗震性能,预应力作用位置对墩顶最大水平位移影响较大。
[Abstract]:The self-reset isolated bridge pier is separated from the contact plane between the pier bottom and the foundation. Under rare earthquake, it can swing, isolate part of the seismic energy transfer, play the role of protecting the bridge pier and foundation, and rely on self-reposition by self-weight after the earthquake. At present, the technique of prestress is seldom studied in self-reset isolated pier. In this paper, the seismic behavior of self-reset isolated pier of vertical prestressed steel bar is studied by numerical analysis method. The main research contents are as follows: 1) by consulting the literature, This paper summarizes the development and application of self-reset rocking structure and its research status at home and abroad. It introduces the basic principle of seismic isolation and the analysis method of seismic response of isolation structure. It introduces several analytical models of self-reset isolated pier. On the basis of two spring models, a self-reset isolated pier model with vertical prestressing bar is proposed. Based on a newly built railway bridge, a single pier analysis model is established, and a nonlinear time-history analysis method is used. The seismic responses of the two spring model and the vertical prestressed steel bar model are studied and compared in three cases with or without prestress. The results show that the prestressing force is applied to the original structure. The seismic behavior of self-reset pier is improved obviously. (5) the prestressing factors that affect the seismic isolation performance of bridge pier are studied. By changing these factors, the parameters are compared and analyzed. The results show that, The magnitude of prestress has a great influence on the seismic response of pier, the proper size of prestress can improve the seismic performance of self-reset isolated pier, and the position of prestress has a great influence on the maximum horizontal displacement of pier top.
【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

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