腹板开孔冷弯薄壁C形钢非纯弯构件有限元分析

Finite element analyses of cold-formed thin-walled C-section steel members with web holes under non-pure bending condition

为了研究非纯弯工况下腹板开孔对冷弯薄壁C形钢构件屈曲性能的影响,对不同孔高比、不同板厚和不同腹板高度的冷弯薄壁C形钢非纯弯构件进行了有限元分析。结果表明:不同孔高比的构件均发生了以局部屈曲为主的局部—畸变相关屈曲破坏。当孔高比不大于0.6时,与未开孔构件相比,开孔构件抗弯承载力变化不大;当孔高比进一步增大至0.8时,构件抗弯承载力大幅陡降。

In order to investigate the effect of web holes on the flexural behaviors of cold-formed thin-walled C-section steel members under nonpure bending condition,cold-formed thin-walled C-section steel members under non-pure bending condition with different hole height-to-web depth ratios,different plate thicknesses and different web depths were selected to conduct the finite element analyses. It is shown that members with different hole height-to-web depth ratios failed by local-distortional buckling interaction controlled by local buckling. When the hole heightto-web depth ratios are not greater than 0. 6,the moment capacities of members with web holes have little changes comparing with members without web holes; when the hole height-to-web depth ratios further increase to 0. 8,the moment capacities of members have sharp declines.