Investigação analítica, numérica e experimental do modo de flambagem distorcional em perfis formados a frio

Abstract

This work deals with distortional buckling of cold-formed lipped channels subject to uniform compression. A review of buckling in thin-walled structures is presented focusing on the distortional mode. Given the still inexistence of an analythical approach to distortional buckling, a rational approach based on Rayleigh Quotient method is developed and presented. In order to validate the proposed methods, results are compared with those obtained with Generalised Beam Theory (GBT) and those obtained with hand-methods for wide range of C-sections. Further analysis of the proposed methods shed some light on the distortional buckling mechanisms. The experimental investigation consisted of compression test of a column prone to distortional buckling with fixed-ends. This investigation included experimental determination of critical loads, observations of the buckling modes and post-buckling behaviour of the column.