公路装配式梁桥抗震性能评估与加固方法研究

发布时间：2018-10-25 13:54

【摘要】：我国位于世界上两大地震带,即环太平洋地震带和亚欧地震带之间,是全球大陆区域中最活跃的地震区之一。与我国现行桥梁抗震设计规范对桥梁抗震性能的要求相比较,当前我国大多数在役公路桥梁存在不同程度的抗震能力不足问题,导致我国目前公路网中桥梁的抗震能力较弱。而桥梁作为生命线工程,一旦发生灾害性的地震,直接和间接经济损失巨大,国内外大量震害资料也表明了桥梁抗震加固研究的重要意义。在我国各级公路体系中,装配式梁桥因其具有形式简单、受力明确、施工方便、工业化标准高等优点,在中小跨径桥梁中得以广泛运用。本论文以公路装配式梁桥为研究对象,开展了装配式梁桥的抗震性能评估与加固的研究,综合起来,本文主要完成了以下工作:(1)在查阅国内外大量文献的基础上,对国内外桥梁抗震性能的评估的研究成果和抗震加固技术进行了较为全面的综述。(2)介绍了桥梁结构抗震性能的评估方法和地震响应分析方法的基本原理,并且介绍了桥梁抗震加固设计方法。(3)介绍了钢筋混凝土的本构关系、截面的弯矩-曲率曲线及滞回曲线的计算模型。同时总结了结构的破坏准则及目前各国的抗震性能目标,根据破坏准则提出了结构的性能目标,给出了合理的关于结构损伤状态的量化描述。(4)结合工程实例,给出了基于外观的震前常规检测评估,利用有限元软件建立了模型,采用能力需求比法对该桥进行了基于反应谱法和基于时程分析法的震前抗震性能评估。(5)根据实际工程震后墩柱的震害状况,确定了加固方案。分别采川减、隔震技术和外包混凝土法对桥梁进行抗震加固,对加固后的桥梁进行时程分析,最后进行了震前与震后加固效果的对比研究。
[Abstract]:China is located between the two major seismic zones in the world, namely, the Pacific Rim seismic belt and the Eurasian seismic belt, which is one of the most active seismic zones in the global continental region. Compared with the requirements for seismic performance of bridges in the current code of seismic design of bridges in our country, most existing highway bridges in our country have insufficient seismic capacity to varying degrees, which leads to the weak seismic capacity of bridges in our country's highway network at present. As a lifeline project, once a disastrous earthquake occurs, the direct and indirect economic losses are huge. A large number of earthquake damage data at home and abroad also show the importance of the bridge seismic reinforcement research. In all levels of highway system in our country, prefabricated beam bridges are widely used in medium and small span bridges because of their advantages such as simple form, clear force, convenient construction and high industrialization standard. This paper takes the highway assembled beam bridge as the research object, and carries out the research on the seismic performance evaluation and reinforcement of the assembled beam bridge. The main work of this paper is as follows: (1) on the basis of consulting a large number of literatures at home and abroad, The research results and seismic strengthening techniques of bridges at home and abroad are summarized. (2) the basic principles of seismic performance evaluation and seismic response analysis of bridge structures are introduced. The design method of seismic reinforcement of bridges is introduced. (3) the constitutive relation of reinforced concrete, the calculation model of moment curvature curve and hysteretic curve of section are introduced. At the same time, the failure criteria of structures and the seismic performance targets of various countries are summarized. According to the failure criteria, the performance targets of structures are proposed, and a reasonable quantitative description of the damage state of structures is given. (4) combined with engineering examples, The routine detection and evaluation before earthquake based on appearance are given, and the model is established by using finite element software. Based on the response spectrum method and time history analysis method, the seismic performance of the bridge is evaluated by the method of capacity requirement ratio. (5) according to the earthquake damage condition of the pier column after the earthquake, the reinforcement scheme is determined. The seismic reinforcement of bridges is carried out by using Sichuan subtraction, isolation technology and concrete outlay method, and the time history analysis of the strengthened bridges is carried out. Finally, a comparative study on the effect of pre-earthquake and post-earthquake reinforcement is carried out.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U442.55;U445.72

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