组合钢箱梁桥三维受力性能研究

组合钢箱梁桥三维受力性能研究(任务书,开题报告,论文17000字)
摘要
钢箱梁被广泛的运用在城市桥梁建设中，有很多立交桥从混凝土桥变成了钢箱梁桥，主要的原因是钢材是一种重量相对轻、柔韧性好、便于施工制造的材料，弥补了混凝土施工比较笨重、需要现配现用、施工周期长等等的不利点。混凝土桥不太适用于较大跨径的高空立交桥，而在钢混组合下在大跨径桥梁已经得到了很好的发挥。组合钢箱梁桥结构是一种将钢和混凝土两种材料性能进行有利互补，共同承担负荷载作用的结构。中小跨径的钢箱梁桥施工方便，经济效益良好，整体性良好，抗震水平高，因此被大量用于建筑工程。本论文研究的是钢—混凝土复合结构的多种类型中的一个。本文通过大型有限元软件ANSYS建立总跨径为30米的，节段组合分为11.46+10+8.54m的钢—混凝土组合钢箱梁桥三维有限元实体单元的模型研究钢箱梁桥细部受力性能，主要内容包括：
①介绍了钢箱梁桥的概念、分类、发展历程以及优缺点；
②阐述了钢—混组合桥梁的目的、作用，以及研究分析组合桥梁的两种设计的基本原理；
③粗略地讲解了影响组合钢箱梁桥受力的因素，和它的变化规律等理论；
④通过ANSYS建模，施加约束和外部荷载，研究桥梁在施加车道荷载和集中荷载情况下钢箱与混凝土板的各部位细节受力情况以及变形。
最后通过理论的分析、实体建模的分析，主要的研究结论有：
①钢箱梁桥的应力应变分布情况；
②位移变形随剪力分布的情况；
③横隔板间距对钢箱梁桥受力后应力应变的影响；
④翼缘板有效宽度对剪力滞的影响；
关键词：钢箱梁桥；三维受力；静力分析；有限元；薄壁杆件
Abstract
Steel box girders are widely used in urban bridge construction. Many overpasses have changed from concrete bridges to steel box girder bridges. The main reason is that steel is a relatively light weight, good flexibility, easy to construct and manufacture material, which makes up for the disadvantages of heavy concrete construction, need for ready-to-use, long construction period and so on. Concrete bridges are not suitable for long-span overpasses, but under the steel-concrete combination, long-span bridges have been well developed. Composite steel box girder bridge structure is a kind of structure which can complement the performance of steel and concrete materials and bear the load together. Medium and small span steel box girder bridges are widely used in construction projects because of their convenient construction, good economic benefits, good integrity and high seismic level. This paper studies one of the various types of steel-concrete composite structures. In this paper, the model of three-dimensional finite element solid element of steel-concrete composite steel box girder bridge with 30 m span and 11.46+10+8.54m segments is established by ANSYS software to study the detailed mechanical properties of steel box girder bridge. The main contents include:            
①The concept, classification, development process, advantages and disadvantages of steel box girder bridges are introduced.           
②The purpose and function of steel-concrete composite bridge are expounded, and the basic principles of two kinds of design of composite bridge are studied and analyzed.            
③The factors affecting the stress of composite steel box girder bridge and its changing law are explained roughly.
④Based on ANSYS model, restraint and external load are applied to study the detailed stress and deformation of steel box and concrete slab under Lane load and concentrated load.
Finally, through the analysis of theory and entity modeling, the main conclusions are as follows:
①Stress and strain distribution of steel box girder bridges;
② Distribution of displacement and deformation with shear force
③The influence of diaphragm spacing on stress and strain of steel box girder bridge after loading;
④The influence of effective width of flange plate on shear lag.
Keywords: steel box girder bridge; three-dimensional force; static analysis; finite element; thin-walled members.

目录
摘要    ２
Abstract    ３
第1章 绪论    ８
1.1 研究背景    ８
1.1.1 钢箱梁桥    ８
1.1.2 箱梁桥的分类    ９
1.1.3 国内外研究历史背景    ９
1.1.4 箱形梁桥的优点和快速发展    １０
1.2 本文主要研究内容及意义    １２
1.2.1 研究意义    １２
1.2.2 研究内容    １２
第2章 组合钢箱梁桥设计理论概述    １４
2.1 组合桥梁的概述    １４
2.2 组合梁桥设计基本原理    １５
2.2.1 弹性设计的基本方法    １５
2.2.2 塑性设计的基本方法    １６
2.2.3 混凝土收缩徐变应力    １７
第3章 影响组合钢箱梁桥构件受力的因素及其变化规律    １８
3.1 剪力滞效应    １８
3.2 薄壁箱梁的弯曲理论    １９
3.3 横隔板的作用    １９
第4章 组合钢箱梁桥件ANSYS三维实体建模与分析    ２１
4.1 钢箱梁桥图纸及其设计要素    ２１
4.1.1 设计要素    ２１
4.1.2 箱梁布置    ２３
4.2 箱梁模型的建模与静力分析    ２７
4.2.1 箱梁模型建模    ２７
4.2.2 横截面和横隔板    ２７
4.2.3 混凝土板    ２９
4.2.4 添加材料（网格划分）    ３０
4.2.5 施加约束    ３１
4.2.6 施加荷载    ３１
4.3 钢箱梁模型静力分析    ３２
第5章 研究结论及设计建议    ３７
5.1 结论    ３７
5.2 不足    ３８
5.3 展望    ３８
致谢    ４０
参考文献    ４１