钢—混凝土简支组合梁的性能研究与数值分析

发布时间：2018-05-21 00:00

本文选题：钢—混凝土组合梁 + 非线性有限元分析　；参考：《石家庄铁道大学》2013年硕士论文

【摘要】：钢—混凝土组合梁作为一种性能良好的组合结构,能够充分发挥钢梁的抗拉强度和混凝土的抗压性能,具有承载力高、刚度大、延性好、节省材料等种种优点。随着高强钢材和高性能混凝土的研制和应用以及设计和施工技术的发展和完善,钢—混凝土组合梁将拥有越来越广泛的应用前景。本文在前人研究成果的基础上,对组合梁的力学性能进行了分析。研究的主要内容包括： (1)对组合梁性能进行理论分析,归纳总结了组合梁的有关计算公式。研究了考虑滑移与不考虑滑移时,钢—混凝土组合梁的正截面受弯承载力计算方法。分析了滑移对组合梁挠度、弹性抗弯强度及极限抗弯强度的影响,并建立了相应的计算公式,为工程设计提供指导。 (2)根据组合梁的特点,选择合适的单元类型和材料本构关系,利用ANSYS建立有限元模型。通过非线性有限元分析,得到相应的荷载—挠度过程曲线。在集中荷载作用下,模拟计算结果与试验情形吻合良好；在均布荷载作用下,模拟计算的结果与经验公式计算结果也基本相符。说明可以利用有限元模型研究组合梁的工作性能。 (3)利用有限元模型对组合梁的极限承载力和滑移性能进行研究。通过对荷载—挠度曲线和荷载—滑移曲线的分析,研究三种抗剪连接度组合梁的极限承载力、刚度和滑移性能特点。在此基础上对组合梁进行了参数分析,研究混凝土强度等级、钢梁强度、截面尺寸等参数变化对组合梁极限承载力、刚度以及滑移性能的影响。并研究采用不同抗剪连接度时,这些参数对组合梁性能影响的改变。
[Abstract]:Steel-concrete composite beam, as a kind of composite structure with good performance, can give full play to the tensile strength of steel beam and the compressive performance of concrete. It has many advantages, such as high bearing capacity, high stiffness, good ductility and saving materials. With the development and application of high strength steel and high performance concrete, as well as the development and improvement of design and construction technology, steel-concrete composite beams will have more and more extensive application prospects. On the basis of previous research results, the mechanical properties of composite beams are analyzed in this paper. The main contents of the study include: 1) the performance of composite beam is analyzed theoretically, and the calculation formula of composite beam is summarized. The calculation method of normal section flexural bearing capacity of steel-concrete composite beams with or without slip is studied. The effects of slippage on deflection, elastic flexural strength and ultimate flexural strength of composite beams are analyzed, and corresponding calculation formulas are established to provide guidance for engineering design. 2) according to the characteristics of composite beam, the appropriate element type and material constitutive relation are selected, and the finite element model is established by ANSYS. Through nonlinear finite element analysis, the corresponding load-deflection process curve is obtained. Under concentrated load, the simulated results are in good agreement with the experimental results, and under uniform load, the simulated results are in good agreement with the results of empirical formulas. The finite element model can be used to study the performance of composite beam. The finite element model is used to study the ultimate bearing capacity and slip behavior of composite beams. Based on the analysis of load-deflection curve and load-slip curve, the characteristics of ultimate bearing capacity, stiffness and slip performance of three kinds of shear connection composite beams are studied. On this basis, the parameter analysis of composite beam is carried out, and the influence of the change of concrete strength grade, steel beam strength and section size on ultimate bearing capacity, stiffness and slip performance of composite beam is studied. The effects of these parameters on the performance of composite beams are studied.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU398.9

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