Development of an Axial Load Capacity Equation for Doubly Symmetric Built-Up Cold-Formed Sections
Publication: Journal of Structural Engineering
Volume 139, Issue 12
Abstract
This work aims to develop an axial load capacity equation for doubly symmetric built-up cold-formed sections with a sufficient number of intermediate, symmetrical connections. A numerical parametric study involving a total of 360 different configurations was conducted, and the numerical results were compared with the experimental data and specifications from the American Iron and Steel Institute (AISI). In this process, the axial load capacities and failure modes, which were influenced by out-of-straightness and out-of-flatness, were thoroughly investigated. To address the issues of an unnecessarily complicated AISI specification for doubly symmetric members subject to distortional buckling, a simple and reliable axial load capacity equation was developed based on a regression analysis of a three-dimensional surface fitting and calibration with the experimental data. This proposed equation exhibited good agreement with the numerically simulated and experimentally measured capacities, while simultaneously ensuring safety and efficiency.
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Acknowledgments
The work presented in this paper was funded by the University of Oklahoma, Star Building Systems, and Engineering Research Institute and College of Engineering of Seoul National University. Also, this work was supported by the National Research Foundation of Korea (2012-005905). The views expressed are those of authors, and do not necessarily represent those of the sponsors.
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Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 12 • December 2013
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 28, 2012
Accepted: Nov 28, 2012
Published online: Dec 1, 2012
Published in print: Dec 1, 2013
Discussion open until: Feb 5, 2014
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