Full-Scale Tests of Slender Concrete-Filled Tubes: Axial Behavior
Publication: Journal of Structural Engineering
Volume 139, Issue 7
Abstract
Composite steel-concrete columns and beam-columns have been shown to provide superior performance when the intrinsic synergistic characteristics of concrete and steel are properly exploited. However, limited test data are available to justify the structural system response factors and comprehensive design equations in current design specifications. This research, through the testing of 18 full-scale, slender concrete-filled steel tube (CFT) beam-columns, addresses these needs by providing comprehensive data to calibrate advanced computational models and assess design equations. The CFT specimens were subjected to complex load protocols that included pure compression, uniaxial and biaxial bending combined with compression, pure torsion, and torsion combined with compression. The results for the pure compression tests reported in this paper indicate that current AISC design provisions provide an accurate estimation of column capacity for both strength and stiffness. The experimental loading response was also contrasted with column curves obtained from advanced, nonlinear fiber analysis models. The experimental and computational column curves are strongly correlated in the elastic critical load range, but showed some differences in the inelastic buckling load range. These differences are attributed to the higher concrete strength assumed in the computational analysis because of the confinement effect of the steel tube; this strength is underpredicted in current design specifications.
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Acknowledgments
The work described here 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 to 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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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 7 • July 2013
Pages: 1249 - 1262
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 18, 2011
Accepted: Dec 4, 2012
Published online: Dec 6, 2012
Published in print: Jul 1, 2013
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