Analysis and Design of Noncompact and Slender CFT Beam-Columns
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
Concrete-filled steel tube (CFT) beam-columns are categorized as compact, noncompact, or slender depending on the governing slenderness ratio (width-to-thickness or ratio, ) of the steel-tube wall. The current AISC specification recommends the bilinear axial force-bending moment () interaction curve for bare steel members for the design of noncompact and slender CFT beam-columns. This paper compiles the experimental database of tests conducted on noncompact and slender CFT beam-columns, and demonstrates the overconservatism of the AISC interaction curve. This paper also presents the development and benchmarking of detailed 3D finite-element models for predicting the behavior and strength of noncompact and slender CFT members. The benchmarked models are then used to evaluate the fundamental interaction behavior of CFT beam-columns, and the influence of material and geometric parameters such as the tube slenderness ratio (), material strength ratio (), member length-to-section depth ratio (), and axial load ratio (). The parametric analyses indicate that for ratios up to 20, the interaction curves are governed by the relative strength ratio (). The parametric analysis results are used to propose revisions to the current standard’s interaction equations for designing noncompact and slender CFT beam-columns.
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Acknowledgments
The research presented in this paper was supported by Purdue University, School of Civil Engineering. The authors acknowledge the contributions of the members of the AISC Task Committee 5 on Composite Columns, particularly the comments and suggestions from Dr. Jerry Hajjar of Northeastern University, Dr. Roberto Leon of Virginia Tech, Mr. Will Jacobs and Dr. Mark Denavit of Stan Lindsey and Associates.
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© 2015 American Society of Civil Engineers.
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Received: Sep 11, 2014
Accepted: May 7, 2015
Published online: Jul 6, 2015
Discussion open until: Dec 6, 2015
Published in print: Jan 1, 2016
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