Strength of Circular Concrete-Filled Tubes with and without Internal Reinforcement under Combined Loading
Publication: Journal of Structural Engineering
Volume 139, Issue 12
Abstract
Concrete-filled tubes (CFTs) have been used in civil engineering practice as piles, caissons, columns, and bridge piers. Relative to conventional structural steel and reinforced concrete components, CFTs have several advantages. The steel tube serves as both reinforcement and formwork, eliminating the need for both, and provides large tensile and compressive capacities; the concrete fill restrains buckling of the steel tube, which increases the strength, stiffness, and deformability of the section. In some cases, internal reinforcement is used to enhance the strength and facilitate connection to adjacent members. Although these properties are well accepted, the use of CFTs in practice is awkward because design provisions among codes vary significantly and previous research has not considered internal reinforcement. An analytical research study was undertaken to evaluate and improve design provisions for CFTs with and without internal reinforcement under combined axial load and bending. A continuum model was developed to simulate prior test results subjected to combined loading and the validated model was used to investigate the strength and inelastic performance of CFTs under combined loading. Current design provisions for CFTs were evaluated using the results of these finite-element analysis and previous test results. The comparisons indicate that current design approach provides good prediction of CFT capacity subjected only to bending or axial demands, but current provisions provide conservative values for the CFTs under general combined loading. An alternative interaction curve for CFTs was proposed.
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Acknowledgments
This paper was completed partially with funding provided by the Washington State Department of Transportation (WSDOT) through the project entitled “Design of Bridge Foundations with Steel Casings.” Mr. Bijan Khaleghi is the WSDOT Bridge Design Engineer and the coordinator of this project. The advice and financial support of the WSDOT is gratefully acknowledged.
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© 2013 American Society of Civil Engineers.
History
Received: Aug 18, 2011
Accepted: Dec 7, 2012
Published online: Dec 10, 2012
Published in print: Dec 1, 2013
Discussion open until: Feb 9, 2014
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