高强冷弯超薄壁型钢墙架受剪性能分析

Analysis of Shear Behaviors of High-strength Cold-formed Ultra-thin-walled Steel Wall Frames

运用有限单元法对一种高强冷弯超薄壁型钢独立墙架和组合墙架进行受剪性能分析,考虑材料非线性和几何非线性影响,研究墙架在水平和竖向荷载共同作用下的极限受剪承载力和变形特征,同时分析墙架立柱间距、墙架高度、拉铆钉间距等参数对墙架受剪性能的影响。结果表明:墙架杆件截面发生局部屈曲和扭转变形是影响这类墙架受剪承载力的主要因素;随着墙架立柱间距、墙架高度及拉铆钉间距增大,墙架结构的受剪承载力明显减小;"K"形支撑体系对防止墙架结构过早发生平面外屈曲起到了关键作用;组合墙架的屈曲荷载随着墙架个数的增加而增加迅速,体现了各墙架间协同工作的抗侧力性能。

The shear behaviors of a type of high-strength cold-formed ultra-thin-wail steel single and compound wall flames were analyzed mainly by FEM. The ultimate shear capacity and deformation characteristics of the wall frame models under the incremental lateral shear loads combined with constant gravity loads were analyzed by considering material and geometric nonlinearity simultaneously. Furthermore, a detail parametric analysis was performed. The results indicated that local buckling and torsion failure of wall member sections were the main factors affecting the ultimate shear capacity of the wall;with the increase of stud space, frame height and rivet distance, the shear capacity of wall frame was decreased; ＂K＂-shape brace system played a key role in preventing the ultra-thin-wall steel wail frame from out-of-plane buckling earlier; the shear capacity of compound wall frames significantly increased with the increase of the number of single frames, which demonstrated the lateral resistance by the cooperation of each single wall frames.