STABILITY BEHAVIOR OF COMPOSITE THIN-WALLED MEMBERS DISPLAYING ARBITRARY ORTHOTROPY

Abstract eng:
The paper presents the formulation and illustrates the application of a second order Generalized Beam Theory (GBT) developed to analyze the stability behavior of thin-walled members displaying arbitrary orthotropy. After reviewing and physically interpreting the 2nd order GBT equations, a brief description of the main steps involved in performing a member GBT linear stability analysis is presented. Next, the paper addresses the issue of whether the critical stress value obtained from a member linear stability analysis corresponds to a “true bifurcation” or simply provides an “asymptotic limit load” and, in particular, a systematic procedure to detect true bifurcations is proposed. Finally, the application and capabilities of the 2nd order GBT are illustrated, by means of an investigation of the local and global buckling behavior of lipped channel columns and beams exhibiting asymmetric orthotropy.

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