Fire Performance of CFST Triple-Limb Laced Columns
Publication: Journal of Structural Engineering
Volume 144, Issue 9
Abstract
This paper investigates the fire performance of concrete-filled steel tubular (CFST) triple-limb laced columns. Six CFST triple-limb laced columns are tested to measure their fire resistance. The influence of column load ratio and steel type on fire resistance are investigated. For comparison, four CFST single-limb columns in fire are tested. The test results indicate that the three CFST chords in CFST triple-limb laced columns can work together very well in fire because of the binding effect provided by the steel lacing tubes. Finite-element analysis (FEA) models are developed to simulate the CFST triple-limb laced columns in fire. The mechanical behavior, including failure modes, deformation, and load distribution, are discussed. Parametric analysis based on the established FEA model is conducted, and a simplified equation is proposed to predict the fire resistance of CFST triple-limb laced columns.
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Acknowledgments
This research is part of the project supported by China National Key Basic Research Special Funds project under Grant No. 2012CB719703. It has also been partially supported by National Natural Science Foundation of China (Grant No. 51778018). The financial support is highly appreciated.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 6, 2017
Accepted: Apr 6, 2018
Published online: Jul 3, 2018
Published in print: Sep 1, 2018
Discussion open until: Dec 3, 2018
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