垫板加强的K型搭接节点滞回性能研究

发布时间：2018-01-28 07:58

本文关键词： 直接焊接的钢管结构垫板加强节点 K型搭接节点有限元分析滞回性能试验研究　出处：《宁夏大学》2017年硕士论文　论文类型：学位论文

【摘要】：直接焊接的钢管结构由于其简洁明快、视觉效果好等诸多优点而得到普遍应用,成为重要的建筑结构形式之一。节点作为管结构的薄弱部位,也是结构耗能的关键部位,对节点的研究是钢结构能否大力推广的关键。本文在静力性能分析基础上,对K型搭接节点通过主管局部焊接垫板的方法进行加强,并制作了 10个节点试件,进行滞回性能试验研究,相应的研究工作和取得研究成果如下:(1)K型搭接节点的静力性能有限元分析:采用ANSYS10.0有限元分析软件,在对已有的试验进行模拟验证基础上,设计节点形式为支主管均为圆管(主圆支圆)的主管未加强、主管管壁垫板局部加强以及主管灌注混凝土的K型搭接节点进行软件分析。通过对比得到未加强节点隐藏焊缝焊接与否,加强节点隐藏焊缝未焊接时,在支杆轴向荷载作用下,焊缝焊接情况、垫板尺寸以及混凝土对节点的破坏模式和承载力的影响。结果表明:未加强节点隐藏焊缝焊接不仅可以提高节点承载力,也可增加节点的塑性变形能力,影响节点的破坏模式。垫板和混凝土对节点加强后破坏模式不发生改变,但承载力明显提高,垫板避免了节点处的应力集中,增大节点的延性,使节点具有较高的安全储备,垫板长度和厚度对节点的性能影响较小。垫板加强节点较混凝土加强节点和隐藏焊缝焊接的未加强节点相比,具有更好的受力性能和更高节点承载力。(2)垫板加强K型搭接节点滞回性能试验研究及有限元分析:鉴于垫板加强节点的良好静力受力性能,考虑施工工艺限制,让节点隐藏焊缝不焊接而进行垫板加强,研究其抗震性能是本次研究的重点。为此,设计支主管截面为主圆支圆、主方支圆的垫板加强节点与未加加强节点,共10个试件进行拟静力试验,探讨不同主管形式、垫板尺寸的节点在循环荷载下的破坏模式、承载力、抗震性能。通过观察试验现象,得到:主圆支圆试件,除K-CCE1试件节点从贯通支管处开裂外,其它节点均因搭接支管屈曲,以及两支管与垫板的连接处焊缝产生较大的开裂而失效。主方支圆试件,裂缝均从两支管的搭接部位产生并扩展到整个搭接区域,因较大的裂缝和支管屈曲而失去承载能力。虽然裂缝开裂和发展的部位不同,但不同主管形式的K型搭接节点,节点破坏模式相同,均为支管屈曲和焊缝破坏模式。同时,通过各节点的试验滞回曲线,得出用以评价节点抗震性能的骨架曲线、刚度退化系数、延性系数、能量耗散系数指标,量化分析了加强节点与未加强节点试件的承载力、刚度、延性和能量耗散等性能。最后,对主圆支圆垫板加强节点实施了滞回性能模拟分析后与试验结果做了对比。本文主要创新性:创建了考虑焊缝建模的有限元计算模型,并且验证了计算模型的可行性。首次系统进了不同主管形式的垫板加强型K节点的足尺拟静力试验,揭示了该类节点的破坏现象、破坏模式和抗震性能,为该类节点高烈度抗震区合理设计与施工提供理论参考依据。
[Abstract]:Steel structure welding because of its simplicity, the advantages of good visual effects and has been widely used and become one of the important forms of building structure. As the node of the weak parts of pipe structure, key parts and structure of energy consumption of nodes is the key to promote the steel structure. This paper based on the static performance on the method of K type joint by the competent local welding plate were strengthened, and made 10 joints, carried out experimental study on hysteretic behavior, some research work and research achievements are as follows: (1) finite element static performance analysis of K type joints: by ANSYS10.0 finite element analysis software. Simulation based test in the existing design, node form branch director for circular pipe (the main branch of circular circle) director of the UN reinforced wall plate, the competent local strong and competent perfusion The software K was used to analyze the type of joints of concrete. By comparing the obtained without hidden weld joints strengthened with or without hidden weld welding reinforced joints, the supporting rod under axial load, welding, impact plate size and the failure mode of the concrete of joint and bearing capacity. The results showed that strengthening the hidden node welding can not only improve the bearing capacity of the joint, it can increase the ability of plastic deformation joints, effects of failure modes of the joints. The concrete plate and the failure modes of the joints strengthened does not change, but the bearing capacity significantly improved, the plate to avoid joint stress concentration, the ductility increases the node, the node security reserve has a high, small plate length and thickness effects on performance of nodes. Nodes than plate reinforced concrete reinforcing node and hidden weld without strengthening nodes compared with Better mechanical properties and higher load-carrying capacity. (2) type K plate reinforced joints hysteretic behavior and finite element analysis: given the good performance of static force plate reinforced joints, considering the restriction of construction technology, let the nodes and hidden weld without welding plate reinforcement, the seismic performance is the focus of this study. Therefore, the design of branch main section mainly supported circular plate round, the main party of a circle without strengthening node and reinforced joints, 10 specimens of pseudo static test, explore the different charge form, failure mode, node plate size in cyclic loading bearing capacity, seismic performance get through observation and experiment phenomenon: the main circle supported circular specimens, except K-CCE1 specimens from node through branch pipes crack, other nodes are due to overlapping pipe buckling, and connection weld pipe and two plate greatly cracking and failure. The main party A circular specimen, cracks are generated from overlapping parts of the two branch pipe is extended to the entire lap area, and loss of bearing capacity due to the larger cracks and pipe buckling. Although the cracking and crack development of different parts, but the K type joints of different charge form, the failure modes are the same, are buckling and weld pipe failure mode. At the same time, through the test of each node of the hysteresis curve, skeleton curve obtained for evaluation of the seismic behavior of the joints, the stiffness degradation coefficient, ductility coefficient and energy dissipation coefficient index, quantitative analysis of the node and the node does not strengthen the strengthening of bearing capacity, the stiffness, ductility and energy dissipation. Finally, the main circle supported circular plate reinforced node implementation of the hysteretic performance after simulation analysis and the test results were compared. The main innovation of this paper: create the finite element model of weld seam calculation model considering, and verify the calculation model For the first time, the full scale quasi-static test of the strengthened K joints with different forms of charge is carried out. The failure mode, failure mode and seismic performance of the joints are revealed, which provides a theoretical basis for the reasonable design and construction of the high intensity seismic area of this kind of joints.

【学位授予单位】：宁夏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU392.3

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