Full-Scale Tests of Slender Concrete-Filled Tubes: Interaction Behavior
Publication: Journal of Structural Engineering
Volume 140, Issue 9
Abstract
This paper presents selected results from an experimental and computational evaluation on the behavior of slender concrete-filled steel tubes (CFTs) under combined axial compression and biaxial flexure. A complex loading protocol was used in the experimental program, including monotonic and cyclic loading that allowed detailed evaluation of the complete beam-column response. This paper principally addresses the experimental determination of the maximum stable axial load–bending moment () interaction strength. The experimental interaction strengths extracted at incipient instability shows that for very slender specimens, the bilinear interaction diagram proposed in the current design provisions of the AISC is somewhat unconservative. This experimental observation is also confirmed by detailed computational results. However, the results also indicate that current AISC provisions provide an accurate and conservative approach for evaluating axial load–flexural interaction for most practical CFT column sizes and lengths (i.e., composite beam columns with low and intermediate slenderness).
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Acknowledgments
The work described in this paper is part of a NEESR project supported by the National Science Foundation under Grant No. CMMI-0619047, the American Institute of Steel Construction, the Georgia Institute of Technology, and the University of Illinois at Urbana-Champaign. In-kind funding was provided by Atlas Tube Inc. and LeJeune Steel Co. The valuable group effort of the MAST personnel in the experimental program is greatly appreciated. Any opinions, findings, and conclusions expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or other sponsors.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 9 • September 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 4, 2013
Accepted: Sep 16, 2013
Published online: Apr 22, 2014
Published in print: Sep 1, 2014
Discussion open until: Sep 22, 2014
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