A numerical imperfection sensitivity study of cold-formed thin-walled tubular steel columns at uniform elevated temperatures

摘要: Abstract A numerical study is carried out on cold-formed rectangular hollow section columns to evaluate the sensitivity of column failure strength initial imperfections, stress–strain relationships and assess existing design methods. It shown that magnitude local buckling imperfection has a significant effect ultimate short where predominantly buckling. Its long relatively small. Similarly global more influence column, whose governed by buckling, than columns, controls. The shape relationship steel will have noticeable load. Current methods, for high temperatures in ENV1993-1-2 ambient temperature ENV1993-1-3, can provide valid basis calculation but modification be necessary, depending exact model at elevated temperatures.