【作者】 康露；

【导师】 王秀丽；

【作者基本信息】 兰州理工大学 ， 结构工程， 2012， 硕士

【摘要】 作为大跨度空间钢结构的形式之一，钢管结构具有结构性能优越以及经济效益良好两大优点，它将建筑与结构协调统一起来。因此，钢管结构成为了近代各类大型标志性建筑所频繁采用的一种结构形式。圆钢管由于其独特的优越性能被广泛应用于空间桁架结构中。圆钢管K形搭接相贯节点因其耗钢量低、受力性能好、承载力大、工艺专业化等诸多优点，日渐成为钢管结构的主要节点形式之一。本文以试验为背景，结合非线性有限元分析，探讨了平面K型圆钢管搭接节点在内隐蔽焊缝焊接与否情况下的受力性能、破坏模式以及对节点承载力的影响的对比分析,此在国内尚无相关研究报道。节点作为空间结构最重要的组成部分，其在反复荷载作用下的荷载—变形曲线（滞回曲线）是对其延性、耗能能力、强度、刚度等力学性能的综合反映。对K型搭接相贯节点内隐藏焊缝焊与不焊两种模型在弦杆轴向往复荷载作用下进行试验研究和有限元模拟计算，对比分析得到节点试件的破坏模式和滞回曲线，同时有限元模拟分析所得结果和试验所得结果较为吻合。结果表明：隐藏焊缝焊接节点破坏时是局部的，最终是搭接管在焊缝处被拉断；不焊节点的破坏模式是焊缝整体破坏，隐藏焊缝不焊对节点承载力的影响不能忽视。通过有限元模拟分析来代替相贯节点滞回性能试验是可行的。更多还原

【Abstract】 Tubular structure is frequently applied in all kinds of large spanstructures in these days. It assorts with structure and architecture in a walk, providedwith predominant structural capacity and satisfied economy benefit. Steel tubes beenused in large span truss structures because of excellent properties. Overlap tubular Kjoints are common features in tubular structures because of their low steel-consuming,excellent mechanics performance, large bearing capacity and special techniques. Onthe basis of overlapped CHS K-joints mode tests, nonlinear FE analyses on jointspecimens are made. The dissertation discusses and analyzed the effect of behavior,failure mechanism and ultimate capacity of overlapped CHS K-joints under the hiddenseam welded or not, which is not available in the national investigation. Joints are themost important parts of the space structure; the load-deformation curve (hystereticcurve) under repeated loading is the comprehensive reflection of their mechanicalproperties such as ductility, energy dissipation capacity, strength, stiffness and so on.By the simulation experiment analysis and the finite element simulation between thetwo models of hidden welding and no-welding hidden in K-type node in the chordaxial reciprocating load resulted in the failure modes and hysteretic curve, the resultof comparative analysis about finite elements is consistent with that of experimentstudy. The results show that the detriment at hidden welding seam node is partly, thetake–over is broken down at the welds finally. The welding line is destroyed overallwhen facing the detriment of no-welding node. The carrying capacity of the hiddenwelding is obvious. Through the finite element simulation analysis instead of phasethrough node hysteretic performance test is feasible.更多还原