既有V墩连续刚构桥顶升改造研究分析

发布时间：2018-05-01 06:42

本文选题：V墩连续刚构桥 + 顶升改造　；参考：《西南交通大学》2017年硕士论文

【摘要】：改革开放以来我国交通事业快速发展,许多桥梁面临不能满足桥下通行或通航要求的问题。这些桥梁中绝大多数的承载能力依然满足要求,拆除重建会造成极大的浪费,顶升改造技术的出现为解决这个问题提供了新的思路。国内外学者对桥梁顶升改造的研究多见于简支梁桥和连续梁桥,对于V墩连续刚构桥顶升改造的研究却鲜有报道。本文基于实际工程项目,对一座V墩连续刚构桥在顶升改造过程中的各个关键工况进行了仿真分析,主要完成了以下工作:(1)结合V墩连续刚构桥的发展现状,分析了桥梁顶升改造的必要性,然后介绍了顶升系统的组成及其工作原理,提出了适用于V墩连续刚构桥的顶升改造技术。(2)依托实际工程建立了 V墩连续刚构桥整体和V墩局部的有限元模型,针对以下工况分别对大桥进行了仿真分析:①顶升之前成桥状态;②顶升过程中切割4#墩并释放约束;③顶升过程中切割5#墩并释放残余约束;④大桥顶升到位。对比了顶升过程中千斤顶不同顶力分布下桥梁的受力状态,提出了合理的千斤顶顶力分布形式。讨论了顶升过程中顶升不同步及温度变化对结构的影响。(3)在大桥顶升到位并接长墩柱后,依据现行规范对桥梁上部结构进行了安全性验算,包括正截面抗弯承载能力验算、正常使用极限状态抗裂验算和持久状况下结构应力验算,并对比分析了顶升改造前后大桥墩底及支座的内力分布以及大桥的自振特性。
[Abstract]:With the rapid development of transportation in China since the reform and opening up, many bridges are facing the problem that they can not meet the requirements of traffic or navigation under the bridge. Most of the load-carrying capacity of these bridges still meet the requirements, demolition and reconstruction will cause a great deal of waste, the emergence of uplift reconstruction technology provides a new way to solve this problem. Scholars at home and abroad research on bridge lifting mostly in simply supported beam bridge and continuous beam bridge, but there are few reports on V pier continuous rigid frame bridge uplift reconstruction. Based on the actual project, this paper simulates and analyzes the key working conditions of a V-pier continuous rigid frame bridge in the process of lifting and rebuilding. The main work is as follows: 1) combined with the development of V-pier continuous rigid frame bridge. This paper analyzes on the necessity of bridge uplift reconstruction, and then introduces the composition and working principle of the jacking system. In this paper, the lifting reconstruction technology for continuous rigid frame bridge with V pier is put forward. The finite element model of the whole and local parts of the continuous rigid frame bridge with V pier is established based on the actual engineering. According to the following conditions, the simulation analysis of the bridge is carried out under the following working conditions respectively. During the process of bridge completion and uplift, the pier is cut and the residual constraint is released during the uplift of the bridge. The stress state of bridge under different jacking force distribution is compared, and a reasonable distribution form of Jack force is put forward. This paper discusses the influence of dissynchronism of hoisting and temperature change on the structure during the process of hoisting. (3) after the bridge is lifted in place and connected with the long pier column, the safety checking calculation of the superstructure of the bridge is carried out according to the current code, including the checking calculation of the flexural bearing capacity of the normal section. The crack resistance checking calculation in the normal use limit state and the structural stress checking calculation under the lasting condition are carried out, and the internal force distribution at the bottom of the pier and the support before and after the lifting and rebuilding as well as the natural vibration characteristics of the bridge are compared and analyzed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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