FRP加固连续梁桥抗震性能及混合试验研究

发布时间：2018-10-09 09:13

【摘要】：钢筋混凝土桥墩是桥梁抗震性能的关键性构件,桥墩一旦在地震中失效将会导致灾难性的后果。目前,桥梁延性抗震设计方法已广泛被世界各国规范所采用。对于在役桥梁,为了控制桥墩在经历地震时的破坏模式,提高全桥抗震性能,FRP抗震加固是一种有效的方式。对于结构抗震试验研究,混合试验是一种先进的抗震试验方法,该方法克服了有限元分析和传统的抗震试验方法的不足。本文试图从结构的角度出发,采用混合试验技术,更高效、更精确地实现对连续梁桥抗震性能的分析,探求合理的桥墩FRP加固方式以提高桥梁的抗震性能。论文所做主要工作如下:(1)总结了桥梁抗震、桥墩FRP抗震加固、桥梁抗震混合试验的研究现状以及一些值得进一步深入研究的方向;总结了目前常用的桥梁抗震计算分析方法。(2)以某双柱墩连续梁桥为研究对象,对其进行了力学分析、桥墩破坏模式分析及FRP加固分析;建立了该连续梁桥的OpenSees有限元模型,对桥墩模型进行了Push-over分析和低周往复分析,对全桥模型进行了动力时程分析。(3)按照1/2.5的相似比制作了2根桥墩模型,对其中1根桥墩的塑性铰区域进行了FRP加固。对未加固桥墩及FRP加固桥墩的连续梁桥进行了抗震混合试验研究。试验结果表明FRP抗震加固效果良好,并验证了混合试验模型的可靠性。本文的研究侧重于全桥结构的抗震性能,以有限元计算模拟和混合试验作为主要研究手段。本文对FRP加固连续梁桥桥墩的合理加固方式提出了改进之处,首次利用混合试验技术研究了FRP加固连续梁桥的抗震性能,实现了抗震混合试验技术在实际桥梁抗震性能研究中的应用。
[Abstract]:Reinforced concrete pier is the key component of the seismic performance of bridge. Once the pier fails in earthquake, it will lead to disastrous consequences. At present, the ductile seismic design method of bridges has been widely used in the world specifications. For existing bridges, in order to control the failure mode of piers during the earthquake, it is an effective way to improve the seismic performance of the whole bridge and FRP seismic reinforcement. The hybrid test is an advanced method for seismic test of structures, which overcomes the shortcomings of finite element analysis and traditional seismic test methods. From the point of view of structure, this paper attempts to use mixed test technology to analyze the seismic performance of continuous beam bridge more efficiently and accurately, and to find out a reasonable FRP reinforcement method of pier to improve the seismic performance of bridge. The main work of this paper is as follows: (1) the research status of anti-seismic bridge, FRP seismic reinforcement of pier and hybrid seismic test of bridge are summarized, as well as some further research directions; This paper summarizes the commonly used methods of seismic calculation and analysis of bridges. (2) taking a continuous beam bridge with double-column piers as the research object, the mechanics analysis, failure mode analysis of pier and FRP reinforcement analysis are carried out, and the OpenSees finite element model of the continuous beam bridge is established. Push-over analysis and low cycle reciprocating analysis are carried out on the pier model, and dynamic time history analysis is carried out on the whole bridge model. (3) according to the similarity ratio of 1 / 2.5, two pier models are made, and the plastic hinge region of one pier is strengthened with FRP. The seismic mixed test of continuous beam bridges with unstrengthened piers and FRP strengthened piers is carried out. The experimental results show that the FRP seismic reinforcement effect is good and the reliability of the mixed test model is verified. This paper focuses on the seismic performance of the whole bridge structure, using finite element simulation and mixed test as the main research means. In this paper, the improvement of the reasonable reinforcement method of continuous beam bridge pier strengthened by FRP is put forward, and the seismic behavior of continuous beam bridge strengthened by FRP is studied for the first time by using mixed test technology. The application of hybrid seismic test technology in the study of seismic performance of practical bridges is realized.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U446

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