箱形柱塞焊与单向螺栓芯筒式连接节点性能试验对比研究

COMPARATIVE STUDY OF EXPERIMENTAL PERFORMANCE ON BOXSHAPED COLUMN CONNECTION ACHIEVED BY PLUG WELDINGCORE SLEEVE AND SELF-LOCK ONE-SIDE BOLT-CORE SLEEVE

对提出的塞焊-芯筒式和单向螺栓-芯筒式连接节点及传统全熔透焊接连接节点进行拟静力试验,对比研究各节点在试验现象、恢复力模型、延性系数、典型部位应变情况及螺栓预拉力等力学性能上的差异,在试验的基础上对芯筒式连接节点进行机理分析。研究结果表明:塞焊-芯筒式连接节点与单向螺栓-芯筒式连接节点均具有良好的承载能力和节点刚度。塞焊数量与单向螺栓数量相同的箱形柱芯筒式连接节点的滞回曲线基本重合,延性系数相近,刚度退化规律基本一致;塞焊数量的增加可提高节点的刚度,减小螺栓的预拉力损失,节点的延性系数有一定提高,承载力的提升不明显;增加塞焊数量的塞焊-芯筒式连接节点的力学性能与传统全熔透焊接连接节点相近。塞焊-芯筒式连接节点的造价相对较低,适用于现场允许少量焊接的情况,单向螺栓-芯筒式连接节点能够实现全螺栓装配,在施工现场无焊接作业,在实际工程设计中可根据工程需求灵活选用两类节点。

The pseudo-static tests were conducted for a box-shaped column connection achieved by plug welding-core sleeve(SHJD),for a box-shaped column connection achieved by self-lock one-side bolt-core sleeve(DLJD),and for a traditional fully-penetrated welded connection(HJJD),to comparatively analyze the difference of mechanical behaviors on test phenomenon,on a restoring force model,on ductility coefficients,on the strain of typical position and on the pretension of high strength friction type bolt of each connection.Based on the test results,the mechanism of a box-shaped column connection achieved by core sleeve has been analyzed.The test results indicate that the SHJD-1,SHJD-2,and DLJD all have excellent bearing capacity and connection stiffness.Equipped with the same number of plug welds and self-lock one-side bolts,the trends of the hysteretic curves,of bearing capacity,of ductility coefficient and of stiffness degradation induced from the SHJD-1 and from the DLJD are basically consistent.The increasing number of plug welds could increase the connection stiffness as well as the ductility coefficient of the connection and could reduce the pretension loss of the bolts.The increasing number could not contribute to the improvement of bearing capacity obviously.Similar mechanical performance is shown between the SHJD-2 and HJJD due to the increasing number of plug welds.The costs of SHJD is relatively low,which is suitable for the construction site where a small amount of welding is allowed.The proposed connection DLJD could realize a box-shaped all-bolted column connection and no welding operation on the construction site.The two kinds of connection could be flexibly selected according to the requirements in an actual engineering design.