Behavior of Self-Compacting Concrete Columns Reinforced Longitudinally with Steel Tubes
Publication: Journal of Structural Engineering
Volume 143, Issue 6
Abstract
This study investigates the behavior of self-compacting concrete (SCC) specimens reinforced with small-diameter steel tubes in lieu of reinforcing bars. Twenty specimens were cast and tested. Four specimens were reinforced with normal steel bars (reference specimens) and the remaining 16 with steel tubes. All specimens contained steel helices with a pitch of either 50 mm or 75 mm. Deformed steel bars of 16-mm diameter were used in the four reference specimens as longitudinal reinforcement. Steel tubes of 33.7-mm outside diameter with 2-mm wall thickness (ST33.7) and steel tubes of 26.9-mm outside diameter with 2.6-mm wall thickness (ST26.9) were used as longitudinal reinforcement in the remaining 16 specimens. The specimens were divided into five groups with four specimens in each group. From each group, one specimen was tested under concentric load, one under 25-mm eccentric load, one under 50-mm eccentric load, and one under flexural load. Although the nominal yield tensile strength of the steel bars was 150 and 250 MPa greater than the nominal yield tensile strength of steel tubes ST33.7 and ST26.9, respectively, the results revealed that steel tube reinforced self-compacting concrete (STR SCC) specimens have ultimate load similar to reference specimens. Ductility of concentrically loaded STR SCC specimens was higher than that of the reference specimens. This study also reveals the challenges associated with using steel tubes as longitudinal reinforcement in STR SCC column specimens due to slip of steel tubes in concrete and explores remedial measures for the slip of steel tubes.
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Acknowledgments
The authors thank the University of Wollongong and technical officers at the High Bay laboratory, especially Mr. Ritchie McLean, for their help in the experimental work of this study. The authors also thank the Orrcon steel company for supplying the steel tubes. Finally, the second author would like to acknowledge the Iraqi Government for the support of his Ph.D. scholarship.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: May 10, 2016
Accepted: Nov 18, 2016
Published online: Feb 14, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 14, 2017
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