钢—混凝土组合梁应力分析及截面优化研究

发布时间：2018-01-04 20:13

本文关键词：钢—混凝土组合梁应力分析及截面优化研究　出处：《长沙理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：钢-混凝土组合梁结构是考虑钢材抗拉与混凝土材料抗压性能良好的各自优点，通过连接件将他们组合成统一的整体而共同工作，将其各自优点充分发挥的结构。在承载能力达到的条件下，不但满足结构需要，还在时间与经济上都能实现一定的收益。钢-混凝土组合梁在高层、大跨度的建筑和桥梁应用广泛，尤为突出的是在城市大跨立交桥等领域的应用，取得的很好的效果，并有进一步发展及推广的意义。目前，对组合梁的研究主要集中于建筑结构方面，在水运工程领域，特别是在越来越向大跨度发展的码头结构中几乎没有应用，也没有相关的规程与规范。因此，本文对组合梁结构在码头大跨度结构中应用可行性做一些相关的研究。总结钢与混凝土组合梁结构国内外发展，主要应用情况和主要研究成果；钢混组合梁的基本原理：钢-混凝土组合梁的类型及构造，钢-混组合梁的工作原理，受力性能分析、组合梁滑移效应、组合梁的截面分析及内力分析；以两跨连续钢-混凝土组合梁为模型，对其应力应变的一些问题，包括横向正应力对承载力的影响和稳定性的一些问题及计算讨论，，并采用ANSYS所建模型的应力应变计算比较分析；对连续组合梁截面特征进行比较分析，将组合梁的各组成部分对其应力应变的影响大小进行比较，结合实用与经济的要求，对组合梁提出优化建议，对正负弯矩区的设计弯矩与抵抗矩进行计算，并分析其合理性。主要得到几点结论：荷载作用在钢梁下翼缘时对组合梁应力应变影响较大，组合梁中集中荷载下横向正应力影响较小；组合梁在大跨度结构中，应考虑稳定性问题，设计时可以采用如钢箱梁之类的更具稳定性的组合梁；连续组合梁在钢材用量，工程造价，刚度大，承载力高等方面优于简支组合梁，码头结构中也应更适合采用连续梁；根据连续组合梁的应力和挠度影响强弱依次为：混凝土板的厚度，腹板高度，钢梁上下翼缘的厚度，腹板厚度，对组合梁截面进行截面讨论，使其更节约钢材，并对组合梁的稳定性有改善。
[Abstract]:Steel - concrete composite beam structure is to consider the advantages of steel and concrete tensile material good compression performance, by connecting them into a unified whole and work together, will give full play to their respective advantages of the structure. The load capacity of the reaching condition, not only meet the structural needs, and the economy can still time to achieve a certain profit. Steel concrete composite beams in high-rise buildings and long-span bridges, widely used, especially the application in the City long span overpass and other fields, have achieved very good results, and further development and promotion significance. At present, the research mainly focuses on the composite beam in the aspect of structure, water transport engineering, especially in wharf structure more and more to the development of the large span almost no application, there is no relevant rules and norms. Therefore, the composite beam structure in Wharf The application of the large span structure to do some related research.
Summary of the steel and concrete composite beam structure development at home and abroad, the main application and the main research results of steel-concrete composite beam; the basic principle: the types and structure of steel-concrete composite beams, steel-concrete composite beam principle, stress analysis of composite beam, slip effect analysis, section analysis and internal force combination beam; with the two span continuous steel-concrete composite beam model, the stress and strain of some problems should be paid, including the transverse normal discussion of stress influence on the bearing capacity and stability of some problems and calculation, and the stress strain ANSYS model calculation comparison analysis; comparative analysis of continuous composite beams section characteristics, combination of each part of the beam stress size is compared with practical and economic requirements, put forward the optimization suggestions for the design of composite beam, bending moment and the resistance moment of the positive and negative moment of Calculation and analysis of its reasonableness.
Mainly get the following conclusions: load on the steel beam bottom flange of composite beam stress and strain influence, the combination of Liang Zhong under the concentrated load transverse stress is less affected; composite beam in large span structure, should consider the problem of stability, can be used in the design of such as more stability such as combination of steel box girder continuous composite beam; the amount of steel beam, engineering cost, high rigidity, high bearing capacity is better than that of simply supported composite beams, the wharf structure should also be more suitable for continuous beam; continuous beam according to the stress and deflection strength is as follows: the concrete slab thickness, web height, steel beam flange thickness, web plate thickness, beam section of discussion, make it more save steel, and improve the stability of composite beams.

【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

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