全螺栓分层装配式轻钢框架抗震性能试验研究

Experimental Study on Seismic Performance of Light Steel Framework with Full-bolted Layered Assembly

为进一步研究全螺栓分层装配式轻钢框架结构抗震性能,考虑轴压比及有无斜向支撑影响,进行4榀单跨双层1/2缩尺试件低周往复加载试验,分析框架初始刚度、承载力、抗震性能及损伤等。结果表明:(1)框架具有良好的延性及抗震耗能能力,但需加强梁柱连接节点螺栓群抗破坏能力,尤其是有支撑试件的情况;(2)在试验轴压比范围内,轴压适当增大可提高试件承载力及耗能能力,但轴压比大于0.3时,延性会降低;(3)增设斜向支撑可明显提高框架承载能力和刚度,但延性和耗能能力略有降低,尽可能提高斜向支撑稳定性,避免其过早发生失稳破坏。

In order to further study the seismic performance of full-bolted layered fabricated light steel frame structure,considering the influence of axial compression ratio and whether or not diagonal braces are added,four single-span double-layer 1/2 scaled specimens are tested under low cyclic loading,and an analysis is given for the frame’s initial stiffness,bearing capacity,seismic performance and damage,etc.The results show that:(1)the frame has good ductility and good seismic energy dissipation capacity,but it is necessary to strengthen the anti-destructive ability of the bolt group in the beam-column connection node,especially the test piece with additional support.(2)Within the test axial compression ratio,an appropriate increase in axial compression can increase the bearing capacity and energy consumption of the test piece.But when the axial compression ratio is over 0.3,the ductility will decrease.(3)The addition of diagonal supports can significantly increase the bearing capacity of the frame and stiffness,but the ductility and energy dissipation capacity are slightly reduced.The stability of oblique braces should be improved as much as possible to avoid premature instability failure.