弯梁桥偏位复位加固方法研究

发布时间：2018-02-06 00:51

本文关键词： 弯梁桥偏位机理加固方案跟踪观　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：弯梁桥是桥梁结构的重要形式之一,它能很好地适应桥址受地形地物限制的需要,而且现代人不断提高审美水平,线条平顺流畅才能满足要求。随着城市公路和高速公路的快速发展,高架桥和互通式立交被大量修建。由于结构受力上的特点,曲线梁桥、尤其是小半径弯梁桥比直线梁桥更容易出现各种病害,上部结构主梁移位并发生局部扭转、梁体开裂、支座及伸缩缝损坏失效。近些年来,全国各地的弯梁桥普遍存在各种病害,以偏位出现最多。所以弯梁桥的养护加固研究迫在眉睫。本文分析了弯梁桥偏位的机理是多方面累积的效应,并陈述了几种常用的弯梁桥偏位加固方案,分别讨论了各加固方案的适用条件。综合LD高速十六标的依托工程,分析依托工程实桥的偏位原因,并针对第二联的高程和线形变化分别分析了变位原因。根据实际情况做对比分析后确定了加固方案,并对加固方案具体细节进行陈述。使用有限元软件Midas/Civil对依托工程大桥进行仿真模拟,采用顶升时的支反力控制顶升量,以8号墩为例分别计算顶升3.0cm、4.0cm、4.5cm、5.0cm时箱梁底板的应力。结合后期观测数据,经加固一年后梁体位置稳定,基本没有位移。
[Abstract]:Curved beam bridge is one of the important forms of bridge structure, it can meet the needs of the bridge site limited by terrain and objects, and modern people constantly improve the aesthetic level. With the rapid development of urban highways and highways, viaduct and interchange have been built. Because of the structural characteristics, curved girder bridge. Especially, small radius curved beam bridge is more prone to various diseases than linear beam bridge, superstructure main beam displacement and local torsion, beam body cracking, failure of support and expansion joint. In recent years. There are many kinds of diseases in curved beam bridges all over the country, and most of them appear in skew position. Therefore, it is urgent to study the maintenance and reinforcement of curved beam bridges. This paper analyzes the mechanism of deflection of curved beam bridges is a cumulative effect of many aspects. Several commonly used deflection reinforcement schemes of curved girder bridge are stated, and the applicable conditions of each reinforcement scheme are discussed respectively. The reason of the deflection of the bridge is analyzed by synthesizing the 16 standard backing project of LD high speed. According to the second combination of elevation and linear changes respectively analyzed the reasons for the displacement. According to the actual situation of comparative analysis to determine the reinforcement scheme. The finite element software Midas/Civil is used to simulate the supporting engineering bridge, and the support reaction force is used to control the uplift. Taking Pier 8 as an example, the stress of the bottom plate of the box girder is calculated when the uplift is 3.0cm ~ 4.0cm ~ (-1) ~ 4.5cm ~ (-1). Combined with the observation data, the position of the beam body is stable after one year's reinforcement. There is basically no displacement.
【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】：U445.72

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