冷弯薄壁型钢门式刚架极限承载力影响因素

为研究冷弯薄壁型钢门式刚架极限承载力,提出梁-弹簧单元模拟冷弯薄壁型钢门式刚架节点工作性能和考虑构件初始几何缺陷影响的有限元模拟分析法,研究冷弯薄壁型钢门式刚架在竖向荷载作用下的变形性能及破坏特征。对已有冷弯薄壁型钢门式刚架试验模型进行模拟分析的结果显示,有限元计算结果与试验结果吻合较好。通过改变构件的腹板厚度和翼缘宽度、节点板厚度、刚架梁坡度、柱脚刚度等因素计算刚架极限承载力,计算结果表明,增大前述各个参数值均可以提高冷弯薄壁型钢门式刚架的极限承载力。

Factors Affecting the Ultimate Bearing Capacity of Cold-Formed Steel Portal Frames

The FEM simulation analysis method was studied to identify the ultimate bearing capacity of cold-formed steel portal frames.In this study,the beam-spring system was used to simulate the performance of joints.The initial imperfection of frame components was considered.The deformation performance and failure features of portal frame structures under vertical loads also were studied.The analytic results of the FEM simulation analysis method are close to the values obtained by experimentation.The ultimate bearing capacity of portal frames were computed by changing parameters such as the web plate thickness,the flange width,the plate thickness of brackets,the portal frame roof inclination,and the column footing stiffness.The analytic results indicate that the ultimate bearing capacity may be improved when the parameters mentioned above are increased.