冲击荷载下K型管节点的实用算法研究

发布时间：2018-11-19 19:20

【摘要】：钢管构件以其自身轻质高强、造型优美以及各向同性等优点,在海洋平台、钢结构建筑、道路桥梁等结构中得到广泛应用。钢管构件的重要构成部分是钢管节点,因此研究钢管节点的力学性能以及破坏模态对钢管结构来说具有十分重要的价值。关于钢管节点承受静力荷载的力学性能探究已经逐渐趋于成熟,在现实生活中,结构经常会遭受地震、撞击、爆炸等突发事件的影响,因此国内外学者对于承受动力荷载的钢结构的抗冲击性能的研究越来越重视。本文将利用有限元软件ABAQUS研究冲击荷载作用下K型钢管节点的破坏模态和力学性能。本文研究主要包括以下方面:1.验证有限元模型。利用有限元软件ABAQUS建立冲击荷载下不同形式的钢管节点模型。通过运算结果与已有文献的位移时程曲线和冲击力时程曲线对比,验证所建有限元模型的适用性和可靠性。对比结果表明:本文有限元模拟结果与所选文献的试验结果相吻合,因此可以证明本文所建有限元模型的准确性,为后文进行K型圆钢管节点的参数分析奠定基础。2.参数分析。通过ABAQUS软件建立不同参数下的K型圆钢管节点模型,设置的参数主要有支管与主管的直径比β、主管管径与壁厚比γ、主管跨度与管径比α、钢材的屈服强度σy、支管与主管的壁厚比τ、支管与主管之间的夹角θ、锤头的质量M以及支管之间的距离g。通过不同参数的不同取值,揭示模型的抗冲击性能、管的塑性凹陷变形以及模型破坏模态变化规律。3.实用算法的研究。通过大量的模型结果对K型钢管节点的主管管顶凹陷量以及最大冲击力进行分析,利用1stOpt软件进行公式的推导,得出主管管顶凹陷量与各参数的关系式以及最大冲击力与管顶凹陷量的关系式,并对其进行适用性的验证。
[Abstract]:Steel pipe members have been widely used in offshore platforms, steel structures, road bridges and other structures due to their advantages of light and high strength, beautiful shape and isotropy. The important component of the steel tube member is the steel pipe joint, so it is very important to study the mechanical properties and failure mode of the steel pipe joint. Research on the mechanical properties of steel pipe joints subjected to static load has gradually matured. In real life, structures are often affected by sudden events such as earthquake, impact, explosion, etc. Therefore, scholars at home and abroad pay more and more attention to the research on the impact resistance of steel structures subjected to dynamic loads. In this paper, finite element software ABAQUS is used to study the failure modes and mechanical properties of K-shaped steel pipe joints under impact loading. This paper mainly includes the following aspects: 1. Verify the finite element model. The finite element software ABAQUS is used to establish the steel pipe joint model of different forms under impact load. The applicability and reliability of the established finite element model are verified by comparing the calculated results with the displacement history curve and the impact time history curve. The comparison results show that the results of finite element simulation in this paper are in agreement with the experimental results of the selected literatures, so the accuracy of the finite element model can be proved, which lays a foundation for parameter analysis of K-shaped circular steel pipe joints in the following years. 2. Parameter analysis. The model of K-shaped circular steel pipe joint with different parameters is established by ABAQUS software. The parameters are mainly the diameter ratio of branch pipe to supervisor, the ratio of tube diameter to wall thickness 纬, the ratio of span to diameter, and the yield strength of steel. The wall thickness ratio 蟿, the angle 胃 between branch tube and supervisor, the mass M of hammer head and the distance between branch tube and branch tube are discussed. According to the different values of different parameters, the impact resistance of the model, the plastic depression deformation of the pipe and the variation law of the failure mode of the model are revealed. 3. Research on practical algorithms. Through a large number of model results, the amount of indentation and the maximum impact force of the K-type steel pipe joint are analyzed, and the formula is deduced by using 1stOpt software. The relationship between the amount of tube top sag and each parameter and the relation between maximum impact force and tube top sag is obtained, and the applicability of the formula is verified.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU392.3

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