Residual Stress and Torsional Buckling Strength of H and Cruciform Columns

Abstract

The torsional buckling strength of axially loaded H and cruciform columns is studied with particular attention given to the effect of residual stress. A. numerical approach was used in evaluating the torsional buckling strength so that columns with various patterns of residual stress distribution could be analysed. A series of five welded built-up cruciform columns of constructional alloy steel have been tested and compared with theoretical results.The results of this study indicate that the widththickness ratio of an outstanding flange made of constructional alloy steel should be limited to 7.5 in order to avoid premature torsional failure.

An experimental study on the local buckling strength of an SBHS700 stub column with cruciform section

“…The ratio s max /s y indicates the local buckling strength of SBHS400 ( ), SBHS500 ( ), SBHS700 ( ) and SM490Y ( ), and they were plotted with the ultimate strength curves introduced by Eqs. (3), (4) and (5). In this study the local buckling strength of SBHS700 was found to be comparable to that of SM490Y, values of which were all above the ultimate strength curves.…”

“…Correspondingly, revision of existing design codes and even proposals for the new codes are necessary. So far, several studies have examined the local buckling phenomena of HSS with different cross-sections, including box sections [1], [2], [3], [4] and cruciform joints [2], [5], [6], [7]. An extensive study of stiffened plates made of HSS with an ultimate strength of 80 kg/mm 2 was conducted in [8].…”

“…An extensive study of stiffened plates made of HSS with an ultimate strength of 80 kg/mm 2 was conducted in [8]. Compression tests on stub columns showed good correlation with the theoretical and numerical evaluation of the local buckling strength [1], [5], and the experimental data were compared with multiple design curves [3], [4]. The effect of width-to-thickness ratio and slenderness ratio have also been evaluated [2], [4], [6], [7].…”

“…The effect of width-to-thickness ratio and slenderness ratio have also been evaluated [2], [4], [6], [7]. The importance of the residual stress effect on the load-carrying capacity of HSS was recognized and investigated in [1], [5], [6].…”

Behaviour, finite element modelling and design of cruciform section steel columns

“…Currently, it is apparent that only limited research has been conducted on cruciform section members compared to other structural components. Comparisons between experimental [1][2][3][4] and numerical results have demonstrated that the existing design provisions generally underpredict the ultimate resistance of steel cruciform section members subject to axial compression, particularly when torsional buckling is critical. In the current European design code EN 1993-1-1 [5], in terms of the provisions for cruciform section members, this conservatism is partly attributed to an effective double-counting of practically the same buckling mode: i.e.…”