复杂空间相贯节点试验研究及有限元分析

发布时间：2018-03-17 05:00

本文选题：杭州东站　切入点：钢管桁架结构　出处：《浙江大学》2013年硕士论文　论文类型：学位论文

【摘要】：空间管结构因其良好的受力性能、优美的外形以及相对低廉的造价,在大跨度结构中得到广泛应用。而节点性能的研究又是空间钢管结构设计的重要环节,因为节点破坏常导致其所连杆件的破坏,通常会导致整个结构的破坏。但目前国内外对钢管相贯节点的研究主要是平面节点或简单规则的空间相贯节点,对于构造复杂的空间相贯节点的研究很少,且各国规范也没有相应节点的设计计算公式。因此对复杂空间相贯节点的研究已成为目前亟待解决的课题。本文以杭州火车东站站房工程和湖州体育场工程为背景,研究这两个工程中若干关键相贯节点的受力性能和承载能力。对杭州东站站房工程中7个关键相贯节点进行足尺试验研究,并对其中3个节点进行内插板对比试验,为杭州东站站房工程钢结构节点设计提供可靠的试验依据,同时对相贯节点的受力性能和应力分布有了更为直观的认识。试验结果表明,各类节点均具有良好的承载能力及足够的安全储备,节点设计安全、可靠；设置内插板对节点受力性能的影响主要有可提高节点极限承载力、改变节点破坏模式、改善节点区应力分布以及减小节点变形等,但内插板对节点受力性能的影响不可一概而论。采用ANSYS有限元软件,对杭州东站进行试验研究的节点进行有限元分析,了解节点受力过程中应力分布、塑性区开展及节点的破坏模态,并确定其极限承载力。将有限元分析结果与试验结果进行比较,结果表明,考虑大变形的弹塑性非线性有限元分析可以较好地模拟试验节点的受力性能。结合湖州体育场钢结构屋盖结构,定义两种新型相贯节点：KTX型和KTK型节点。对这两种节点分别进行了几何参数和荷载效应参数的有限元分析,找出其受力性能、应力分布、破坏模态和承载力的分布规律。研究发现,两类节点在轴力作用下的破坏模式以弦杆管壁塑性破坏模式为主；腹(支)弦杆直径比和弦杆径厚比对节点承载力影响较大,腹(支)弦杆壁厚比对节点承载力的影响不显著。
[Abstract]:Space-tube structures are widely used in long-span structures because of their good mechanical performance, beautiful shape and relatively low cost, and the research on the performance of joints is an important link in the design of spatial steel pipe structures. Because the joint failure usually leads to the damage of the connecting rod, it usually leads to the damage of the whole structure. But at present, the research on the steel pipe intersecting joint is mainly the plane joint or the simple regular space intersected joint. There is little research on the construction of complex spatial intersecting nodes, and there is no design formula for the corresponding nodes in various countries. Therefore, the study of complex spatial intersecting nodes has become an urgent task to be solved. Based on the project of Hangzhou East Railway Station and Huzhou Stadium, this paper studies the mechanical performance and bearing capacity of some key intersecting nodes in these two projects. The full-scale test of seven key intersecting nodes in Hangzhou East Station House Project is carried out, and three of them are tested by the contrast test of internal board, which provides a reliable test basis for the design of steel structure joints in Hangzhou East Station House Project. The experimental results show that all kinds of joints have good bearing capacity and sufficient safety reserve, and the design of joints is safe and reliable. The influence of internal plate on the mechanical behavior of joints can improve the ultimate bearing capacity of joints, change the failure mode of joints, improve the stress distribution in the joint area and reduce the deformation of the joints, and so on. However, the influence of the inner panel on the mechanical performance of the joints can not be generalized. The finite element analysis of the joints of Hangzhou East Railway Station was carried out by using ANSYS finite element software to understand the stress distribution, plastic zone development and failure mode of the joints during the process of loading. The finite element analysis results are compared with the experimental results. The results show that the elastoplastic nonlinear finite element analysis with large deformation can well simulate the mechanical behavior of the test joints. Combined with the roof structure of Huzhou Stadium steel structure, two new types of joints, namely: KTX type and KTK type, are defined. The geometric parameters and load effect parameters of the two joints are analyzed by finite element method, and the mechanical properties and stress distribution are found out. It is found that the failure mode of the two kinds of joints under axial force is mainly plastic failure mode of chord wall, and the ratio of diameter to diameter and diameter to thickness of string is more important to the bearing capacity of the joint. The effect of the wall thickness ratio on the bearing capacity of the joint is not significant.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU392.3

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