半刚性冷弯薄壁C形钢框架抗震性能

Seismic Behavior of Semi-Rigid Frame Using Cold-Formed Thin-Walled C-Shaped Steel

针对采用半刚性节点连接的双肢冷弯薄壁C形钢框架,采用拟静力试验与有限元模拟相结合的方法,对9榀双层单跨框架进行抗震性能分析。分析了节点螺栓直径、节点板厚度、螺栓间距及节点板加腋大小等参数对框架抗震性能的影响。结果表明:增大螺栓直径、增加节点板厚度和节点板加腋均能提高框架的承载力,改善框架的抗震性能。当螺栓间距小于80mm时,框架的承载力及抗震性能随间距的增大而增大;当螺栓间距大于80mm时,承载力及抗震性能受其影响较小。使用8.8级M16高强度螺栓,框架节点板产生了较大的滑移,建议在框架设计时应对节点螺栓的抗剪承载力进行验算。

This paper presents a research of the seismic behavior of nine two-story and single-span semi-rigid frames using coldformed thin-walled double C-shaped steel.Finite element simulation and pseudo-static test are used to evaluate the influence of many parameters including bolt diameter,thickness of gusset plate,bolt spacing and size of chamfer of gusset plate.The results show the seismic behavior and bearing strength of the frames can be significantly improved by increasing the bolt diameter,the thickness of gusset plate,and using hunching gusset plate with chamfer connection.The bearing capacity and seismic behavior of the frames are improved with increase in bolt spacing up to 80 mm.The shear strength of bolts should be verified because the frame joint can slip when the 8.8 M16 high strength bolts are used.