Nonlinear behaviour of back-to-back gapped built-up cold-formed steel channel sections under compression

摘要: Abstract In cold-formed steel structures, such as trusses and portal frames, the use of back-to-back gapped built-up channel-sections for column members are becoming increasingly popular. an arrangement, lowest flexural buckling mode may not necessarily be overall whole column. literature, only three test results have been previously reported columns, limited to values non-dimensional slenderness ranging from 1.08 1.16. This issue is considered herein. The 40 experimental tests reported, conducted on covering range stub slender columns. A nonlinear finite element model then described that shows good agreement with results. used purposes a study comprising 84 models. Using results, it shown design in accordance American Iron Steel Institute (AISI) Australian New Zealand Standards (AS/NZS) can conservative by much 53%. However, modification slenderness, considers gap, standards being within 5% respect