Eccentric Axial Load Capacity of High-Strength Steel-Concrete Composite Columns of Various Sectional Shapes
Publication: Journal of Structural Engineering
Volume 140, Issue 4
Abstract
Two concrete-filled steel tube columns and four concrete-encased steel columns using high-strength steel (yield strength , 806, and 812 MPa) and high-strength concrete (compressive strength , 113, 104, and 184 MPa) were tested to investigate the effect of various sectional shapes and configurations on the eccentric axial load carrying capacity. This study focused on maximizing the contribution of the high-strength steel, preventing early crushing of the concrete (1) by using steel tubes or closely spaced ties for lateral confinement, (2) by using ultra high-strength (200 MPa) concrete with a high-crushing strain, and (3) by placing L-shaped steel sections at the corners of the cross section. The test results showed that the steel tube successfully restrained early concrete crushing and developed its full plastic stress; unlike expectation, early crushing occurred in the ultra high-strength concrete column; and the concrete-encased L-section column had higher peak strength and flexural stiffness than the conventional concrete-encased H-section columns. For the design of the concrete-filled columns, the conventional plastic design method is applicable, whereas the strain-compatibility method should be used for the design of the concrete-encased columns with limited lateral confinement.
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Acknowledgments
This research was supported by grants from the High-Tech Urban Development Program (09 R&D A01) and R&D Policy Infra Program (Code 11-Technology Standardization-09-01), funded by the Ministry of Land, Transportation and Maritime Affairs of Korea, and the authors are grateful to the authorities for their support.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 4 • April 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jul 19, 2012
Accepted: May 22, 2013
Published online: May 24, 2013
Published in print: Apr 1, 2014
Discussion open until: Apr 29, 2014
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