冷弯薄壁C形截面不锈钢梁畸变屈曲承载力研究

Research on the Distortion Buckling Capacity of Cold-formed Thin-walled C-section Stainless Steel Beams

为研究纵向V型肋卷边C形不锈钢梁的畸变屈曲承载力,本工作在非纯弯试验短跨梁、纯弯试验短跨梁、纯弯试验长跨梁三组试验研究的基础上,采用有限元软件进一步研究纯弯作用下不锈钢C形梁腹板加劲不同位置以及腹板、翼缘同时加劲时不同加劲位置对构件极限承载力的影响。并使用有限条软件分析不同截面高度、卷边宽度、翼缘宽度、加劲位置对构件极限承载力的影响,最后对弹性屈曲临界应力公式和基于直接强度法的畸变屈曲承载力公式进行了修正。研究发现腹板、翼缘的加劲位置都会对承载力的提升幅度有较大影响,修正后的公式具有较高的精度。

In order to study the distortion buckling capacity of C-shaped stainless steel beams with longitudinal V-rib crimping,this work uses finite element software to further study the effects of different stiffening positions of the web of stainless steel C-shaped beams under pure bending and different stiffening positions of the web and flange on the ultimate bearing capacity of the components on the basis of three sets of experimental studies of the short-span beam under the impure bending test,the short-span beam of the pure bending test,and the long-span beam of the pure bending test.The effects of different cross-sectional heights,crimping widths,flange widths and stiffening positions on the ultimate bearing capacity of the components were analyzed by finite bar software,and finally the formula of critical stress of elastic buckling and the formula of distortion buckling bearing capacity based on the direct strength method were modified.It is found that the stiffening position of the web and flange will have a great impact on the improvement of bearing capacity,and the modified formula has high accuracy.