钢筋混凝土空心高墩延性抗震研究及优化

发布时间：2018-03-19 05:22

本文选题：桥梁空心高墩　切入点：塑性铰　出处：《青岛理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：地震一直以来都是土木工程领域的一重大难题，破坏巨大而又难预测，而且同时我国地貌类型错综复杂，，山区面积多，所以西部的公路铁路线路不可避免的要跨越深沟险壑，这就使得桥梁在线路中往往要占到很大的比例，山区桥梁运用高墩能够使得桥型更加合理、经济、节约成本。而对于通常的高墩桥梁结构都不属于一般的规则桥梁范畴，该类桥梁的抗震设计现如今国内外都没有现成的规范可依。所以，研究一个专门对于高墩桥梁的抗震设计新理念，深入研究桥梁高墩的抗震设计问题，以此来提高我国高墩桥梁的抗震能力，是非常有必要的。本文运用非线性有限元分析软件ABAQUS对典型的钢筋混凝土空心高墩的延性性能以及抗震设计方法进行了研究，主要有以下这几个方面的研究工作： ①介绍了高墩的延性类别、塑性耗能机制、延性指标及延性构造措施等延性抗震设计方法； ②运用非线性有限元分析软件ABAQUS对典型的钢筋混凝土空心高墩进行模拟，分析其轴压比、纵向配筋、横向约束配箍及混凝土强度等因素对墩柱延性抗震的影响，比较在不同情况下截面的曲率延性系数，从而得到这几个因素对典型的钢筋混凝土空心高墩延性性能的影响； ③结合第四章的影响高墩延性抗震的轴压比、配筋、混凝土等的因素分析结果，提出并验算了一种钢筋混凝土空心高墩的延性抗震优化方案，增大塑性铰区外截面的强度，通过对比分析在不同地震强度下墩柱的塑性铰单元分布、最大延性系数及墩顶位移来验证其对延性抗震的影响。最后，总结了本文中的成果及不足之处，对空心高墩延性的分析研究提出了进一步的研究方向。
[Abstract]:The earthquake has always been a major problem in the field of civil engineering. The damage is huge and difficult to predict. At the same time, the geomorphology of our country is complicated and there are many mountainous areas, so the highway and railway lines in the west inevitably have to cross deep gully and gully danger. This makes bridges often account for a large proportion of the lines. The use of high piers in mountain bridges can make the bridge more reasonable, economical and cost effective. But for the normal bridge structures with high piers, they are not in the general category of regular bridges. Nowadays, there are no ready-made codes for aseismic design of this kind of bridges at home and abroad. Therefore, a new concept of seismic design for bridges with high piers is studied, and the problem of seismic design of high piers of bridges is deeply studied. It is necessary to improve the seismic capacity of high pier bridges in China. In this paper, the ductility and seismic design methods of typical reinforced concrete hollow high pier are studied by using nonlinear finite element analysis software ABAQUS. The main contents are as follows: 1. The ductile seismic design methods of high pier, such as ductility type, plastic energy dissipation mechanism, ductility index and ductile structural measures, are introduced. The nonlinear finite element analysis software ABAQUS is used to simulate the typical reinforced concrete hollow high pier, and the influence of axial compression ratio, longitudinal reinforcement, transverse confined hoop and concrete strength on the ductility of pier column is analyzed. By comparing the curvature ductility coefficient of the section under different conditions, the influence of these factors on the ductility of typical reinforced concrete hollow high pier is obtained. Based on the results of the analysis of the factors such as axial compression ratio, reinforcement, concrete and so on, which affect the ductility of high pier in Chapter 4th, a ductility seismic optimization scheme for hollow high pier of reinforced concrete is proposed and verified to increase the strength of the section outside the plastic hinge area. The effect of plastic hinge element distribution, maximum ductility coefficient and pier top displacement on ductile earthquake resistance is verified by comparing and analyzing the plastic hinge element distribution, maximum ductility coefficient and pier top displacement under different earthquake intensity. Finally, the achievements and shortcomings of this paper are summarized, and the further research direction of the ductility of hollow high piers is put forward.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.22;U442.55

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