中承式钢管混凝土拱桥新增吊杆法加固技术研究

发布时间：2018-02-05 17:07

本文关键词： 钢管混凝土拱桥新增吊杆法数值仿真吊杆加固施工控制　出处：《中外公路》2017年01期 　论文类型：期刊论文

【摘要】：吊杆是中承式钢管混凝土拱桥重要的组成部分和受力构件,其可靠程度直接影响结构的使用性和安全性。由于在运营过程中长期受到自然条件和人为因素的影响,拱桥吊杆出现了不同程度的损伤,使其加固工作备受关注。针对更换吊杆法普遍存在的破坏结构局部受力的问题,介绍了一种主动加固吊杆的方法——新增吊杆法。并以玉带桥吊杆加固为工程背景,介绍了新增吊杆的布置及构造,对全桥进行三维数值仿真分析,比较了吊杆加固前后拱肋内力、吊杆内力和拱桥稳定性的变化情况,并通过施工过程控制对新增吊杆内力和桥面线形进行监控。结果表明:新增吊杆法可大幅减小既有吊杆的应力水平,但对拱肋受力和拱桥稳定性影响不大;加固过程中新增吊杆拉力实测值与计算值符合较好,桥面高程变化最大未超过6mm,是一种安全、可行的吊杆加固方法。
[Abstract]:Suspension rod is an important component and force member of the through concrete filled steel tube arch bridge. Its reliability directly affects the use and safety of the structure. Due to the impact of natural conditions and human factors for a long time in the operation process, the arch bridge suspenders appear different degrees of damage. The reinforcement work has been paid more attention to, aiming at the local force problem of the damaged structure which is commonly existed in the method of replacing the suspenders. This paper introduces a method of active reinforcement of suspenders-the method of adding suspenders. Taking the reinforcement of suspenders of jade belt bridge as the engineering background, the arrangement and construction of the new suspenders are introduced, and the three-dimensional numerical simulation analysis of the whole bridge is carried out. The internal forces of arch ribs, the internal forces of suspenders and the stability of arch bridges are compared before and after reinforcement of suspenders. The results show that the stress level of the existing suspenders can be greatly reduced by the new suspender method, but it has little effect on the arch rib force and the stability of the arch bridge. It is a safe and feasible method to strengthen the suspension rod with the measured value of the new suspender tension in the process of reinforcement and the calculated value, and the maximum variation of the height of the bridge deck is not more than 6 mm. it is a safe and feasible method for the reinforcement of the suspension rod.
【作者单位】：西南交通大学土木工程学院;
【基金】：中央高校基本科研业务费专项资金资助项目(编号:2682015CX078) 中国铁建股份公司科技研究开发计划资助(编号:2014-C34)
【分类号】：U445.72

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