竖向荷载作用下冷弯薄壁型钢墙架柱的承载力

采用有限元法对冷弯薄壁型钢住宅墙架柱在竖向荷载作用下的承载力进行了分析。通过对不带墙板墙架柱和一面石膏板、一面定向刨花板墙架柱试验试件在竖向荷载作用下的承载力、破坏模式和变形分析,验证了有限元法的正确性。采用有限元法分析了墙板厚度、柱间距、螺钉间距等参数对墙架柱承载力的影响。结果表明,当墙板厚度在11 mm以上时,增大墙板厚度不能提高墙架柱的轴向承载力;当墙架柱间距由400 mm增大到600 mm时,轴向承载力略有提高;当中间螺钉间距大于600 mm时,减小螺钉间距可显著提高墙架柱轴向承载力;当中间螺钉间距小于600 mm时,继续减小螺钉间距对轴向承载力的提高不明显。分析了冷弯薄壁型钢住宅中常用墙架柱在竖向荷载作用下的承载力,给出了这种墙架柱轴向承载力的设计建议。

Bearing Capacity of Cold-Formed Thin-Walled Steel Wall Stud Under Vertical Load

Authors adopted finite element method(FEM) to study the bearing capacity of the studs of cold-formed thin-walled steel residence under vertical load.By the analysis for bearing capacity,failure mode and deformation of different studs unlined and those with plasterboards on one side and orient stand board on the other side,the accuracy of the FEM was validated.The influence of the parameters,including thickness of sheathings,studs spacing and screws spacing on the bearing capacity of studs was analyzed by FEM.The results show that when the thickness of sheathing is above 11 mm,the increase of thickness of sheathing can not enhance the axial bearing capacity of studs; when the studs spacing increase from 400 mm to 600 mm,the bearing capacity increases slightly;when the middle screws spacing is larger than 600 mm,the decrease of the screws spacing can increase the axial bearing capacity significantly; when the middle screws spacing is shorter than 600 mm,the increase of the axial bearing capacity since the decrease of screws spacing is not salient.The bearing capacity of the studs which was often used in cold-formed steel residential under vertical load,and the suggestion of design of the axial bearing capacity of such studs were presented.