轴力作用下冷弯T形方钢管节点受冲击荷载力学性能研究

发布时间：2018-06-21 01:46

本文选题：预加轴力 + T形管节点　；参考：《湖南大学》2015年硕士论文

【摘要】：随着社会经济的快速发展,越来越多的钢管结构建筑得到广泛的运用,由于撞击、爆炸、地震等灾害,导致结构严重受损甚至倒塌的事故时有发生,因此钢管结构的抗冲击性能引起众多学者的关注。钢结构建筑在使用过程中,由于结构自重、设计承重等荷载的存在,管结构主管会承受一定轴向力。管节点作为钢管结构的关键部分,它的抗冲击性能对钢管结构的整体抗冲击能力有着非常重要的影响。若管节点受到侧向冲击荷载作用时,节点部位的破坏会造成结构刚度、承载能力、稳定性能的下降,从而造成结构的整体失效甚至倒塌的严重后果,因此,对管节点抗冲击性能进行研究有着重大的工程意义。本文对预加轴力的T形方钢管节点在受侧向冲击荷载作用下的力学性能进行研究,主要工作有以下几点:(1)进行了预加轴力的T形方钢管节点的落锤冲击试验。试验主要控制变量是节点主管轴压比与支主管宽度比。试验获得了试件的破坏模式、位移时程曲线、冲击力时程曲线等数据,并就上述两个变量对节点抗冲击性能的影响做了初步分析。(2)运用ABAQUS软件建立预加轴力的T形管节点落锤冲击模型,并通过对比模型与试验获得的破坏形式、冲击力时程曲线、位移时程曲线等数据,证明有限元模型的结果和试验结果吻合较好,从而验证了有限元模型的合理性与准确性,为后文的机理分析提供基础。(3)通过分析节点的局部与整体变形、能量耗散等抗冲击性能指标,对预加轴力的T形方钢管节点抗冲击机理进行初步分析。对预加轴力的T形方钢管节点的局部加强做了初步的尝试与探讨。
[Abstract]:With the rapid development of social economy, more and more steel pipe structures have been widely used. Due to impact, explosion, earthquake and other disasters, serious structural damage or even collapse accidents occur from time to time. Therefore, the impact resistance of steel pipe structure has attracted many scholars' attention. In the process of using steel structure, due to the existence of load such as structural self-weight and design load, the pipe structure supervisor will bear a certain axial force. As a key part of steel pipe structure, the impact resistance of pipe joint has a very important effect on the overall impact resistance of steel pipe structure. If the pipe joint is subjected to lateral impact load, the failure of the joint will result in the deterioration of the stiffness, bearing capacity and stability of the structure, which will result in the overall failure of the structure and even the serious consequences of collapse. It is of great engineering significance to study the impact resistance of pipe joints. In this paper, the mechanical properties of T-shaped square steel pipe joints subjected to lateral impact load are studied. The main work is as follows: 1) the drop weight impact test of T-shaped square steel pipe joints with pre-axial force is carried out. The main control variable of the test is the ratio of axial compression ratio of node supervisor to the width of branch supervisor. The data of failure mode, displacement time history curve, impact force time history curve and so on are obtained. The influence of the above two variables on the impact resistance of the joints is analyzed. (2) using Abaqus software to establish the impact model of the T-shaped tube joints with pre-loading force, and comparing the failure form and the impact time history curve between the model and the test. The displacement time history curve and other data show that the results of finite element model are in good agreement with the experimental results, which verifies the rationality and accuracy of the finite element model. The impact resistance mechanism of T-shaped square steel pipe joints with preloading axial force is analyzed preliminarily. This paper makes a preliminary attempt and discussion on the local strengthening of T-shaped square steel pipe joints with pre-axial force.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU392.3

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