FRP约束钢筋混凝土桥墩抗震性能分析

发布时间：2018-02-13 14:00

本文关键词： FRP 桥墩抗震性能 Opensees　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国是一个地震频发的国家,桥梁作为生命线工程的重要组成部分,加强其抗震能力对地震后续的生命救援、物资的运输等关乎生命的行动的展开是极其必要。桥墩是桥梁的主要抗侧力构件,在地震作用下,水平地震力主要作用在桥墩的上部,并通过桥墩向下传递,而且桥墩是支撑着桥体的主要构件,同时也承担者轴向的荷载作用,所以桥墩极其关键。要想桥梁在地震中屹立不倒,首先要增强桥墩的抗震性能。对纤维增强复合材料(Fiber Reinforced Plastics, FRP)的研究发现,将其应用于钢筋混凝土结构的加固会对结构的抗震性能有很大的提高。加之具备轻质、高强、耐腐蚀的特性,因此应用FRP来提高桥墩的抗震性能是个不错的选择。而Opensees软件作为开放的地震工程模拟实验室,在模拟地震作用下的结构响应分析方面有着很强大的功能,有着丰富的材料模型库和很好的非线性数值模拟精度。因此本文应用Opensees来进行FRP约束钢筋混凝土桥墩抗震性能的分析。主要的研究内容如下：(1)对国内外FRP约束混凝土的本构关系的研究现状分析总结,选择适合本文模拟分析情况的本构模型。(2)应用Opensees对FRP不同包裹方式的桥墩施加低周往复荷载做滞回性能分析,对各滞回曲线对比研究,分析确定不同的包裹部位对桥墩滞回性能的影响；研究FRP不同包裹层数的滞回性能,以此研究FRP厚度与桥墩抗震性能之间的关系。(3)应用Pushover方法对不同包裹厚度的桥墩做静力弹塑性分析,来评价结构的抗震性能,进一步研究FRP厚度对桥墩抗震性能的影响,输入地震波对桥墩进行了动力时程分析,评价不同的约束方案对桥墩的位移时程的影响。
[Abstract]:Our country is a country with frequent earthquakes. As an important part of lifeline engineering, bridges strengthen their seismic capacity to save the lives of subsequent earthquakes. It is extremely necessary to carry out life-related actions such as transportation of materials. Piers are the main lateral force components of the bridge. Under earthquake, horizontal seismic forces mainly act on the upper part of the pier and are transmitted down through the pier. And the piers are the main components that support the bridge, and they are also subjected to axial loads, so the piers are extremely critical. If the bridge is to stand up in an earthquake, The research on fiber reinforced composite fiber Reinforced plastics (FRP) shows that the application of FRP to reinforced concrete structure will greatly improve the seismic performance of the structure, in addition, it has the advantages of light weight and high strength. Therefore, it is a good choice to use FRP to improve the seismic performance of bridge piers. As an open laboratory of earthquake engineering simulation, Opensees software has a very powerful function in structural response analysis under simulated earthquake. It has abundant material model base and good nonlinear numerical simulation precision. Therefore, this paper uses Opensees to analyze the seismic behavior of reinforced concrete pier confined by FRP. The main research contents are as follows: 1) mixing FRP constraint at home and abroad. Analysis and Summary of the Constitutive relationship of Condensed soil, Choosing the constitutive model suitable for the simulation and analysis of this paper. (2) using Opensees to analyze the hysteretic behavior of the pier with different wrapping modes of FRP under low cycle reciprocating load, and comparing the hysteretic curves. The effects of different wrapping positions on the hysteretic performance of bridge piers are analyzed, and the hysteretic properties of FRP with different number of wrapping layers are studied. The relationship between the thickness of FRP and the seismic behavior of pier is studied. The Pushover method is used to analyze the static elastoplastic behavior of the pier with different thickness to evaluate the seismic performance of the structure, and to further study the influence of the thickness of FRP on the seismic performance of the pier. The dynamic time history analysis of the pier is carried out by input seismic wave, and the influence of different constraint schemes on the displacement time history of the pier is evaluated.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55

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