Experimental and Analytical Investigation of Concrete Filled Steel Tubular Columns
Publication: Journal of Structural Engineering
Volume 137, Issue 6
Abstract
In this paper, an experimental and analytical investigation of concrete-filled steel tubular (CFST) laced columns is presented. These columns consist of four concrete-filled steel tubes that are laced together. A total of 27 experimental tests were conducted to quantify the column failure mechanism at ultimate loads. The experiments were designed to obtain the load-deflection curves. These curves were subsequently used to quantify the structural behavior for each element of the hybrid column. Experimental results indicate that the compression force in the longitudinal members dominated the failure mechanism in the CFST columns. In-plane bending occurred when member segments reached the compression failure load. The forces in the lacing members (diagonal and horizontal bracing) were found to be small and remained in the elastic range through failure. The experimental study was used to validate an analytical parametric study. The analytical study showed that increasing slenderness ratios and eccentricities reduced the ultimate load capacity. Additionally, finite-element analyses of CFST columns based on four in situ structures were performed to determine the ultimate load-carrying capacity and were subsequently compared to several building codes. On the basis of the analytical results, a new methodology for calculating the ultimate load-carrying capacity is proposed. This purposed methodology is compared with five different building codes to quantify the increased accuracy.
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Acknowledgments
This research work has been conducted under Grant No. UNSPECIFIED2008F3005 of the Young Talent Project of Fujian Province and Grant No. UNSPECIFIED50578042 of the Chinese National Science Foundation. This support is sincerely appreciated.
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© 2011 American Society of Civil Engineers.
History
Received: Oct 1, 2009
Accepted: Sep 12, 2010
Published online: Sep 22, 2010
Published in print: Jun 1, 2011
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