钢管桁架结构K形搭接节点抗震性能试验研究

按钢管桁架结构K形搭接节点隐藏焊缝焊接情况制作了4个足尺试件，通过对其进行拟静力试验，研究K形搭接节点内隐藏焊缝在焊与不焊情况下的试件变形、破坏模式、节点的耗能性能等。得到了试件的滞回曲线、骨架曲线、承载力、延性性能、耗能能力等抗震性能指标。试验结果表明：K形搭接节点内隐藏焊缝对试件的承载能力影响不大；节点的破坏模式主要是搭接支管的变形与屈曲以及搭接支管与被搭接管、主管之间连接焊缝的破坏；隐藏焊缝不焊接节点试件的滞回耗能优于隐藏焊缝焊接的节点试件；隐藏焊缝不焊接节点试件的变形是隐藏焊缝焊接节点试件的1.1~1.2倍。

Experimental research on seismic behavior of unstiffened overlapped CHS K-joints

Quasi-static tests on four full-scale unstiffened overlapped CHS K-joints specimens with welded and non-welded hidden welds were conducted under low cycle load to study the behavior of unstiffened overlapped CHS K-joints of truss structure of steel pipe. The deformation characteristics, failure mode and energy dissipation were investigated. The hysteretic loops, skeleton curves, bearing capacity, ductility and energy dissipation were obtained. Test results indicate that the bearing capacity of unstiffened overlapped CHS K-joints is affected with welded and non-welded hidden welds, however, the hysteretic behavior of the joints is not very significantly affected. The typical failure mode is the local buckling of bracing member and the connecting weld damage between the braces and the chord member. Hysteretic property of the joints in which the hidden weld is non-welded is much better than that of the joints with welded hidden weld. The hidden weld that is non-welded deforms 1.1-1.2 times more than the welded hidden weld.