Behavior of Octagonal High-Strength Steel Tubular Stub Columns
Publication: Journal of Structural Engineering
Volume 145, Issue 12
Abstract
This paper investigates the behavior of octagonal high-strength steel tubular cross sections under axial compression. Experimental investigations were conducted on cross sections with three nominal dimensions fabricated from different routes of welding or combinations of cold-bending and welding. Material properties and geometric imperfections of the cross sections were measured and are reported here. A total of 18 stub column tests were carried out; load-deformation histories and failure modes of octagonal high-strength steel tubular-section stub columns are presented and discussed. Nonlinear finite-element models were validated to replicate the stub column tests and subsequently applied to carry out parametric studies for further investigating the structural performance of octagonal tubular cross sections with various slenderness values under axial compression. The results from experiments and finite-element modeling are used to evaluate the applicability of codified cross-section classification limits and various existing design methods to octagonal high-strength steel tubular cross sections under axial compression. Modifications to the cross-section classification limits and design methods are proposed to obtain more accurate predictions of cross-section classification and strengths of structures for efficient structural design.
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Acknowledgments
The research described in this paper was supported by a grant from the Research Grants Council of Hong Kong Special Administrative Region, China (Project No. 15249216). The authors also thank the Construction Industry Council and the Chinese National Engineering Research Centre for Steel Construction (Hong Kong Branch) at The Hong Kong Polytechnic University for their support.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 12 • December 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 22, 2018
Accepted: Mar 22, 2019
Published online: Sep 21, 2019
Published in print: Dec 1, 2019
Discussion open until: Feb 21, 2020
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