建筑学论文桁式组合拱桥典型病害及其对力学性能的影响研究

1、桁式组合拱桥典型病害及其对力学性能的影响研究 桁式组合拱桥典型病害及其对力学性能的影响研究 study on the typical diseases and effect on the mechanical properties of the trussed combination arch bridge【中文摘要】 桁式组合拱桥作为我国上世纪八十年代首创的一种新型桥型,以其结构轻盈美观、跨越能力强、省工省料、施工简便等突出优点,在近20年来得到了大力的推广,并取得过很好的成绩。然而经过20多年来的发展和使用,这种桥型逐渐暴露出许多缺陷,病害情况日益严重。本文结合六盘水都格大桥己出现的病害状

2、况,进行了静力、动力试验研究,并分析病害成因。通过对都格大桥现有的主要病害及结构损伤部位的调查,运用大型有限元分析软件midas2006与ansys11.0,建立了计入结构损伤的有限元模型,并逐步调整模型各部位的刚度值,最终使得分析得到的桥梁各项力学性能与试验结果相符。在此基础上计算分析了该桥在恒载、预应力、混凝土收缩、徐变、整体温差、活载和两种最不利荷载组合工况作用下各控制截面的应力及变形情况。同时介绍了该桥的加固设计方案。论文详细介绍了桁式组合拱桥静力、动力试验研究、仿真模型的建立过程及不同荷载工况作用下的计算结果,最后分析了桁式组合拱桥病害形成的原因,并对病害桁式组合拱桥加固设计及方法进

3、行了初步的探讨。文中所提到的分析方法,所运用的分析手段以及所得到的分析结论对指导桁式组合拱桥管理养护具有一定的参考价值。【英文摘要】 trussed combination arch bridge was first created in china in the eighties of the last century .it has many advantages, such as beautiful lightness structure, large spanning ability, saving labor and material, comparison of simple co

4、nstruction and etc.in the past 20 years it has been strongly promote and have achieved very good results. however, after 20 years of development and use, this bridge type gradually revealed numerous shortcomings and disease is becoming more serious. in this paper, according to the emerging disease o

5、f the duge bridge in the city of liupanshui, carried out static and dynamic experimental research and analysis of the causes of diseases. through the survey of main diseases and structural damage of the duge bridge, we use the large-scale finite element analysis softwares midas2006 and ansys 11.0 to

6、 establish the finite element model, which included the establishment. and gradually adjust the stiffness value of each part of the model. eventually make the mechanical properties of the bridge in line with the experimental results. on this basis calculated analyzed the control sections of the stre

7、ss and deformation of the bridge under the dead load, prestress, concrete shrinkage, creep, the overall temperature, live loads and the most adverse conditions. at the same time, the reinforced methods were introduced. in the paper, described in detail of the trussed combination arch bridges static

8、and dynamic tests of the simulation model set up process and the role of different load conditions of the calculation results. finally analyzed the causes of diseases of this type bridge, and discussed the design and reinforcement methods.the analysis methods, the employed analytical tools as well a

9、s the analysis we obtained have a reference value to guide the management and conservation of the trussed combination arch bridge【中文关键词】 桁式组合拱桥; 典型病害; 力学性能; 有限元模型; 加固方法 【英文关键词】 trussed combination arch bridge; typical diseases; mechanical properties; finite element model; reinforcement methods 【毕业论文

10、目录】摘要 3-4 abstract 4 第一章 绪论 8-15 1.1 桁式组合拱桥的产生与发展 8-11 1.2 桁式组合拱桥运营现状及病害 11-14 1.3 论文主要工作 14-15 第二章 桁式组合拱桥典型病害 15-27 2.1 典型病害特征 15-16 2.2 桁式组合拱桥病害检查 16-25 2.2.1 工程概况 16-17 2.2.2 桥面高程测量 17-20 2.2.3 结构病害检查结果 20-25 2.3 病害原因分析 25-26 2.4 小结 26-27 第三章 桁式组合拱桥力学性能试验研究 27-51 3.1 引言 27 3.2 静力性能试验研究 27-44 3.2.

11、1 静力试验方法 27-29 3.2.2 测点布置 29-30 3.2.3 试验加载方法 30-34 3.2.4 试验结果 34-42 3.2.5 试验结果分析 42-44 3.3 动力性能试验研究 44-50 3.3.1 试验方法 44 3.3.2 测点布置 44-45 3.3.3 试验工况 45-46 3.3.4 试验结果 46-49 3.3.5 试验结果分析 49-50 3.4 小结 50-51 第四章 损伤状态下桁式组合拱桥有限元分析 51-79 4.1 引言 51 4.2 损伤状态下桁式组合拱桥有限元模型 51-53 4.2.1 有限元模型基本假定 51 4.2.2 有限元仿真模型的

12、建立 51-53 4.3 结构静力计算分析 53-68 4.4 结构动力计算分析 68-78 4.4.1 ansys 有限元软件简介 68-69 4.4.2 动力分析理论 69-72 4.4.3 桥梁自振特性分析 72-73 4.4.4 计算模型的建立 73 4.4.5 全桥(未增加横桥向约束)自振特性计算 73-76 4.4.6 全桥(增加横桥向约束)自振特性计算 76-78 4.4.7 计算结果分析 78 4.5 小结 78-79 第五章 病害桁式组合拱桥加固方法探讨 79-91 5.1 引言 79 5.2 桁式组合拱桥病害原因分析 79-82 5.2.1 混凝土的裂缝分析 79-82 5.2.2 桁式组合拱桥主要病害 82 5.3 裂缝成因分析 82-84 5.3.1 局部拉应力超过限值引起的裂缝 83 5.3.2 干湿混合接头部位的混凝土干缩裂缝 83 5.3.3 桥面