DSM DESIGN OF DISTORTIONAL BUCKLING FAILURE OF THIN-WALLED COLD-FORMED STAINLESS STEEL COLUMNS

Abstract

This work reports the results of a numerical-computational study of the structural buckling and post-buckling (elastic and elastic-plastic) behavior of Cold Formed Steel (CFS) lipped-channel columns with austenitic (304) and ferritic (430) steels buckling and failing in distortional mode. This analysis aims to evaluate the current specifications for the design of these elements using Direct Strength Method (DSM). Initially, it describes the criteria’s adopted for the selection of the columns via GBT (Generalized Beam Theory), in which different types of support conditions (pinned-pinned and prevented-prevented) even as different geometric dimensions were considered. After this phase, the modeling of the columns with shell elements in the ANSYS is performed, applying the initial imperfections to perform the non-linear analyzes of elastic-elastic and elastic-plastic buckling, obtaining the ultimate load. Finally, the numerical results obtained in this work are reported, discussed and compared with the predictions obtained through the Direct Resistance Method (DSM).