既有铁路桥梁钢筋混凝土Ⅱ型梁强度、刚度衰减及加固研究

发布时间：2018-03-04 21:06

本文选题：既有铁路桥梁　切入点：强度、刚度衰减　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年来,随着我国经济水平的日益提高,交通事业蒸蒸日上。在政府几十年以来的大力投资下,我国公路、铁路网得到了巨大的发展。就目前整体情况来说,我国铁路网已经基本成熟,在可以预见的未来数十年内,新建工程有所减少。同时,国内许多运营时间较长的铁路桥梁会出现不同程度的病害,会对交通运输造成安全隐患。因此,对于该种桥梁的检测、维修、养护、加固及改造工程就不可避免。从国内外普遍建设运营情况看,对旧桥进行加固、改造具有良好的经济、社会效益,且重新投入运行后表现良好,性能完全满足现有标准。目前,我国有关桥梁加固设计与计算的研究开展还相对比较相对滞后,不能满足日益增多的加固需求。本文以破损情况较为典型的既有铁路桥梁(清姜河铁路桥)为研究目标,对其进行了实地检测。对该桥梁的病害情况进行了详细的描述并以太行1内燃机车对其分别进行了静力荷载和动力荷载试验研究,得出跨中挠度、混凝土应变、钢筋应变等主要工程数据。将2013年的数据与2006年的清江河铁路桥检测报告进行了对比分析,得出了其强度、刚度衰减的一些特点和规律,并对强度以及刚度衰减后的桥梁的加固补强效果进行了分析评价。然后利用Midas/civil有限元软件建立了该桥梁其中一跨的П型梁有限元模型。利用所建立的桥梁π形梁实体模型,分别对其进行增大横截面、粘贴一定尺寸和厚度的碳纤维布、粘贴8mm厚度的钢板处理,然后进行计算分析。通过软件计算结果分析这三种措施对该π形梁正截面的极限抗弯承载力、挠度、刚度以及塑性变形能力等多方面的影响。最后归纳出这三种方法对于本项工程的适用性,方便实际工程的应用。
[Abstract]:In recent years, with the development of our country's economic level, the transportation industry is booming. Thanks to the government's strong investment in the past decades, the highway and railway networks in our country have been greatly developed. As far as the overall situation is concerned, China's railway network has been basically mature, in the foreseeable future decades, the number of new projects has decreased. At the same time, many domestic railway bridges with longer operating time will have different degrees of disease. Therefore, for the detection, maintenance, maintenance, reinforcement and reconstruction of this kind of bridge, it is inevitable. From the general construction and operation situation at home and abroad, strengthening and rebuilding the old bridge has a good economy. At present, the research on bridge reinforcement design and calculation in China is relatively lagging behind. The purpose of this paper is to study the existing railway bridges (Qingjiang River Railway Bridge), which are typical of the damaged situation. The damage of the bridge is described in detail, and the static load and dynamic load of the bridge are studied by using Taihang No. 1 diesel locomotive. The deflection of span and the strain of concrete are obtained. By comparing the data of 2013 with the test report of Qingjiang River Railway Bridge on 2006, some characteristics and rules of strength and stiffness attenuation are obtained. Then the finite element model of the bridge with one span is established by using the Midas/civil finite element software, and the solid model of the 蟺-shaped beam is established by using the model of the 蟺-shaped beam of the bridge, and the reinforcement effect of the bridge is analyzed and evaluated after the strength and stiffness of the bridge are attenuated. The cross section is enlarged, the carbon fiber cloth of certain size and thickness is pasted, and the steel plate with 8 mm thickness is treated. Then the calculation and analysis are carried out. The results of software calculation are used to analyze the ultimate flexural bearing capacity and deflection of the 蟺-shaped beam. Finally, the applicability of these three methods to this project is summarized, which is convenient for practical application.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U445.72

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