Impact of code differences for tubular members

Abstract

Abstract This paper discusses the impact on the design strength of tubular members caused by differences in specifications from various regions of the world. The specifications that are considered are the latest limit states design codes from five regions. Both circular and rectangular hollow sections manufactured by either hot-form or cold-form methods are considered. The first comparison deals with the column buckling strength. Codes differ not only in the design equations, but also in whether a distinction is made between hot- and cold-formed tubes. The design strengths resulting from these differences can be over 20%. The comparisons continue with the consideration of local buckling in thin-walled members in both axial compression and in bending. Not only do the equations for the local buckling strength differ, but the codes vary on whether an interaction with overall column buckling is considered. The conclusion of the paper is that the same tube, particularly thin circular sections, used in various part of the world may have a significantly different design strength. Some possible reasons for these differences are stated.