2019 CSCE Annual Conference - Laval (Greater Montreal) Conference
Dr. Anjan Bhowmick, Concordia University
Multisided steel tubular sections are commonly used in many structures such as light posts, road sign post, transmission and telecommunication towers etc. These sections are generally subjected to axial compression and bending. From design point of view, it is very important to make sure that these thin-walled sections do not buckle locally before yielding. While current AASHTO and ASCE have provided slenderness limits to check for local buckling of eight, twelve and sixteen sided polygonal steel sections, very limited study has been conducted to evaluate these slenderness limits. This paper presents a finite element (FE) analysis based study of local buckling of multisided steel tubular sections. A nonlinear finite element model which includes both material and geometric nonlinearities is developed for this study. The finite element model is validated against experimental results from six stub columns of three different cross sections (i.e. Octagonal, Dodecagonal, and Hexdecagonal) tested under concentric compression. The validated finite element model is then used to analyze a series of multisided steel tubular sections of different lengths under combined compression and bending. Three different geometry, namely, eight, twelve and sixteen sided polygonal sections, are considered. Both linear buckling and nonlinear static analyses are conducted using ABAQUS. Results from FE analyses are used to evaluate the slenderness limits specified in different standards.