体外预应力技术在重载铁路桥梁加固中的应用研究

发布时间：2018-06-16 18:13

本文选题：重载铁路 + 超低高度梁　；参考：《中南大学》2014年硕士论文

【摘要】：摘要：随着时间的推移和经济的发展越来越多的桥梁不适应交通的需要,桥梁的加固和维修是解决这个问题的主要方法之一。针对在原设计活载为中-活荷载的朔黄线24m预应力超低高度梁T梁和32m普通高度梁制定加固方案,要求加固后的梁在新既定活载下满足规范对承载力和竖向刚度的要求。采用Midas软件对原梁和加固后的梁进行数值模拟。在原设计荷载下梁的静活载下最大挠度值和各项应力指标可以满足规范要求,在加固设计目标荷载下32普通高度梁跨中挠度可以满足规范要求,但是应力超出限值,24m超低高度梁挠度和应力均超出限值,需要对原梁进行加固。采用体外预应力加固方法可以很好的满足在新活载下32m普通高度梁跨中挠度限值要求和各项应力指标的检算。24m超低高度梁的加固则可采用体外索和钢辅助梁共同加固的方式来解决结构刚度不足和应力指标超限的问题。这种加固方法结合了体外预应力和钢辅助梁加固的双重优点,很好的解决了单独使用预应力加固所带来的刚度不足的问题。
[Abstract]:Absrtact: with the passage of time and economic development, more and more bridges can not meet the needs of traffic. The reinforcement and maintenance of bridges is one of the main methods to solve this problem. In view of the reinforcement scheme of 24 m prestressed ultra-low height beam T beam and 32 m ordinary height beam of Shuohuang line, which was originally designed as mid-live load, it is required that the strengthened beam meet the requirements of bearing capacity and vertical stiffness of the strengthened beam under the new established live load. Midas software is used to simulate the original beam and the strengthened beam. Under the original design load, the maximum deflection value and each stress index of the beam under the static and live load can meet the requirements of the code, and the deflection of 32 ordinary height beams under the reinforcement design objective load can meet the requirements of the code. However, the deflection and stress of the 24m ultra-low height beam exceed the limit value, so it is necessary to strengthen the original beam. The method of external prestressing reinforcement can satisfy the limit requirement of deflection of 32m ordinary height beam under new live load and the check of stress index. 24m super low height beam can be strengthened by external cable and steel auxiliary beam. The method of strengthening is used to solve the problem of insufficient stiffness and over-limit of stress index. This method combines the advantages of external prestressing and steel auxiliary beam reinforcement, and solves the problem of stiffness deficiency caused by using prestressing alone.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72

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