桥梁结构加固方法比较与研究

发布时间：2019-01-13 08:16

【摘要】：在我国经济快速持续发展的带动下,交通运输业尤其是公路桥梁越来越成为国民经济的一个重要环节,车辆密度越来越大,重型车辆增多,我国使用公路桥梁中有相当一部分由于达到设计使用年限、施工质量差、维护不到位、严重的超载等多方面的原因,桥梁的安全状况不容乐观。文章介绍了常用的混凝土桥梁结构加固方法,如增大截面加固法,粘贴钢板加固法,碳纤维加固法等,对常见的桥梁加固补强方法进行系统的归纳总结和分析,还介绍了在选取方案选取要遵循的一般原则,以及常见的桥梁破坏方式等,后面介绍了碳纤维加固技术的研究现状和发展历程等。本文选取桥墩为主要研究对象,并通过OpenSEES有限元软件比较了不同碳纤维加固方式的加固效果,分析方法包括以下几种,希望本文的一些观点能为桥梁加固设计提供合理的建议。 (1)动力时程分析的结果能较为真实的反映结构的地震反应,通过比较在地震作用下桥墩墩顶位移来分析加固效果。 (2) pushover方法是用于评估结构抗震性能的一种静力弹塑性方法,避免了非线性动力分析的繁琐,又具有较好的准确性。本文通过对施加墩顶集中力的pushover方法来比较结构的性能。 (3)滞回曲线反映了结构在反复受力过程中的变形特征和刚度退化等,通过滞回环围成的面积大小来反应结构的塑性变形能力。
[Abstract]:Driven by the rapid and sustained economic development of our country, transportation, especially highway and bridge, has become an important link in the national economy. The density of vehicles is increasing, and the number of heavy vehicles is increasing. Due to many reasons, such as reaching the design service life, poor construction quality, poor maintenance, serious overload and so on, the safety condition of the bridges in our country is not optimistic. This paper introduces the common reinforcement methods of concrete bridge structure, such as the reinforcement method of increasing section, the strengthening method of sticking steel plate, the strengthening method of carbon fiber, and so on. The common methods of strengthening and strengthening bridges are summarized and analyzed systematically. It also introduces the general principles to be followed in the selection of the selection scheme and the common bridge failure modes. The research status and development process of the carbon fiber reinforcement technology are also introduced at the end of this paper. In this paper, the bridge pier is selected as the main research object, and the reinforcement effect of different carbon fiber reinforcement methods is compared by OpenSEES finite element software. The analysis methods include the following several kinds of methods. It is hoped that some of the views in this paper can provide reasonable suggestions for the bridge reinforcement design. The main results are as follows: (1) the results of dynamic time history analysis can truly reflect the seismic response of the structure, and the reinforcement effect is analyzed by comparing the displacement of pier top under earthquake. (2) pushover method is a static elastoplastic method used to evaluate the seismic performance of structures, which avoids the complexity of nonlinear dynamic analysis and has good accuracy. In this paper, the performance of the structure is compared by applying the concentrated force on the top of the pier by pushover method. (3) the hysteretic curve reflects the deformation characteristics and stiffness degradation of the structure in the process of repeated loading, and reflects the plastic deformation ability of the structure by the size of the area formed by the hysteresis loop.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72

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