Eccentric-Axial-Load Test for Composite Columns Using Bolt-Connected Steel Angles
Publication: Journal of Structural Engineering
Volume 146, Issue 9
Abstract
For better structural performance and constructability, a concrete-encased steel column that uses a steel cage prefabricated with bolt connections was developed. The steel cage consists of longitudinal steel angles and transverse steel plates. As a fundamental verification of the proposed column, an eccentric-axial-load test was performed on eight composite column specimens. Test parameters included column type (i.e., conventional concrete-encased steel column versus proposed column), shape and spacing of transverse plate, and axial load eccentricity. The test results showed that, owing to the high flexural stiffness of the steel angles placed at the corners of the cross section, the axial strength and ductility of the proposed column were greater than those of the conventional composite column using a wide flange steel section at the center of the cross section, particularly in the large eccentricity of axial load. Z-section plates and closely spaced flat plates used for transverse reinforcement provided better lateral confinement to the concrete, thereby increasing the load-carrying capacity of the proposed columns. In general, existing design methods safely predicted the axial-flexural capacities of the specimens. Nonlinear numerical analysis was performed to verify test results. The numerical analysis results agreed with the test results in terms of yield stiffness, peak strength, and postpeak strength degradation.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The Institute of Engineering Research, Institute of Construction and Environmental Engineering, at Seoul National University provided research facilities for this work. This research was also supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) funded by the Ministry of Land, Infrastructure and Transport (19AUDP-B106327-05). The authors are grateful for the support of these authorities.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jul 10, 2019
Accepted: Feb 6, 2020
Published online: Jun 25, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 25, 2020
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