K型圆管相贯节点的滞回性能分析及试验

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。

The Hysteretic Performance Analysis and Experiment on K-type Overlap Joints of Circular Steel-tubes

Joints are the most important parts of the space structure, the load-derormation curve (hysteretic curve) under repeated loading is the comprehensive reflection of their mechanical properties such as ductility, energy dissipation capacity, strength, stiffness and so on. By the simulation experiment analysis and the finite element simulation between the two models of hidden welding and no-welding hidden in K-type node in the chord axial reciprocating load resulted in the failure modes and hysteretic curve, the result of comparative analysis about finite elements is consistent with that of experiment study. The results show that the destroyment at hidden welding seam node is partly, the take-over is broken down at the welds finally. The welding line is destroyed overall when facing the destroyment of no-welding node. The carrying capacity of the hidden welding is obvious. Through the finite element simulation analysis instead of phase through node hysteretic performance test is feasible.