桥墩结构损伤和修复方法研究
桥墩结构损伤和修复方法研究(任务书,开题报告,论文20000字)
摘要
桥墩作为桥梁的主要支撑结构，其承载的能力将会直接影响整个桥梁的安全。但在包括材料老化、自然环境、偶然撞击以及车辆荷载作用等不同因素的影响，桥墩可能会出现不同程度的损伤。近一二十年，由于大量已建桥梁的老化，对于桥墩的性能研究一直是热点问题，所以国内外的专家学者也提出了许多相关的结构损伤和修复理论。
首先，本文整理和总结了有关桥墩损伤和修复的一些理论，结合某景观步行桥门形异形墩，通过大型有限元分析软件ANSYS 15.0建立有限元模型并进行数值分析，得到了桥墩的结构受损部位。
其次，在明确桥墩的受损位置后，通过施加不同的荷载来研究各个控制截面在设计荷载下的受力特点，并验算代表性截面的极限承载力。
最后，针对桥墩受损的实际情况，提出了运用绕丝加固法来修复和加固景观步行桥的方案，该桥墩的易受损截面的承载力也得到了一定加强。
通过对桥墩结构损伤和修复的研究，能够在一定程度上确保桥梁的安全并延长桥墩的使用寿命。文中所提出的结构损伤识别方法和修复方法也可以为今后旧桥的桥墩修复加固提供参考和借鉴。
关键词：桥墩损伤评估；桥墩损伤修复；有限元分析；绕丝法
Abstract
Bridge pier，the bearing capacity of which will directly affect the safety of the bridge, is the main supporting structure of bridge. But under the effect of the material aging, natural environment, accidental impact and vehicle loads and other factors, pier may appear varying degrees of damage. In recent ten or twenty years, due to the aging of a large number of existingbridges, the research on the performance of bridge piers has been a hot issue, and many experts and scholars at home and abroad have put forward a lot of theoriesaboutstructural damage and repair.
First of all, some theories of the bridge damage and repair, briefly sorted out and summarized in this paper, combined with the door-shaped pier of south paddock river landscape walking bridge that was modelled and numerically analyzed by the finite element analysis software ANSYS 15.0 that in turn figured out the structural damage position of the pier.
Secondly, after the damage position of the bridge pier is defined, there is a necessity to study the stress characteristics of the control section under the design load and check the ultimate bearing capacity of the representative section by applying different loads. [资料来源：www.doc163.com]
Finally, In view of the actual situation of damaged bridge pier, the method of using exterior spiral reinforcement method to repair and reinforce the landscape walking bridge has been put forward, and the bearing capacity of the bridge pier is also strengthened.
Through the research of bridge pier damage and repair, it is possible, to a certain extent, to ensure the safety of the bridge and to extend the service life of a bridge pier. The proposed structural damage identification methods and repair methods can also provide reference for bridge pier repair and reinforcement of the old bridges in the future.
Keyword：pier damage assessment；pierdamage repair；finite element analysis；
exterior spiral reinforcement method
[资料来源：https://www.doc163.com]
目录
1.绪论 1
1.1研究目的和意义 1
1.2国内外研究现状 1
1.2.1 桥梁结构损伤理论概述 1
1.2.2桥墩结构损伤理论与现状调查 2
1.3桥墩安全性分析 4
1.4本文的主要内容 5
2.结构损伤识别理论 7
2.1基于频率的损伤识别理论 7
2.2基于柔度矩阵的损伤识别理论 9
2.3基于振型的损伤识别理论 10
2.4本章小结 12
3. ANSYS有限元模型 13
3.1 有限元方法的概述 13
3.2 ANSYS简介 13
3.3工程概况和基本资料 13
3.4有限元模型的建立 16
3.4.1基本假定 18
3.4.2单元定义 19
3.4.3材料参数 20
3.4.4建模、网格划分及耦合 21
3.4.5小结 23
3.5桥墩的受力性能分析 23
3.5.1重力和水流冲击力下的受力性能 24
3.5.2重力、水流冲击力和墩顶荷载下的受力性能 25
3.6桥墩的极限承载力验算 27
3.7本章小结 27
4.桥墩损伤修复方法研究 29
4.1桥墩修复加固比较 29
4.1.1拆除重建法 29
4.1.2增大截面法 29
4.1.3套箍加固法 30
4.1.4 FRP加固技术 30
4.1.5小结 31
4.2本文的实例桥墩修复方法 31
5.结论与展望 34
致谢 35
参考文献 36
[来源：http://www.doc163.com]