冷弯薄壁型钢构件畸变屈曲研究现状

State-of-the-Arts: Distortional Buckling of Cold-Formed Thin-Walled Steel Members

冷弯薄壁型钢开口截面构件受力过程中除出现局部屈曲和整体屈曲外,还可能出现另外一种畸变屈曲模式,畸变屈曲以及其与局部屈曲、整体屈曲的相关作用会降低构件的极限承载力,改变构件的受力性能。介绍了畸变屈曲的特点和性能,总结了国内外冷弯薄壁型钢构件畸变屈曲试验与理论研究成果,并对北美规范、澳洲规范、欧洲规范、英国规范以及我国规范关于畸变屈曲的设计计算方法进行了归纳介绍,最后在分析的基础上总结了畸变屈曲研究目前尚需解决的问题。

The distortional buckling may occur for cold-formed thin-walled steel open cross-section members except local buckling and overall buckling.The distortional buckling and interaction with local and overall buckling may decrease the ultimate load-carrying capacity of members and change mechanical properties.The characteristics of distortional buckling of cold-formed thin-walled steel members were introduced,experimental and theoretical research status of distortional buckling were summarized,and design methods of distortional buckling using different national code were described in this paper,including 'North American specification for the design of cold-formed steel structural members(AISI S100—2007)','Australian/New Zealand standard for cold-formed steel structures(AS/NZS 4600∶2005)','Supplementary rules for cold formed thin gauge members and sheeting(EN 1993-1-3∶2006)','Code practice for design of cold-formed thin gauge sections(BS 5950—5∶1998)' and 'Technical code of cold-formed thin-wall steel structures(GB 50018—2002)'.Based on the review analysis,some problems about distortional buckling of cold-formed thin-walled steel members were presented.