Axial Compressive Behavior of Concrete-Encased High-Strength Steel Angle Columns
Publication: Journal of Structural Engineering
Volume 147, Issue 4
Abstract
This study investigated the compressive behavior of concrete-encased high-strength steel angle columns (). Axial compressive tests were performed on six composite columns with different angle sections and confinement details. The results showed that the failure mode of the columns was local buckling of the angle legs and crushing of the confined core. Local buckling and concrete confinement significantly affected the compressive strength and ductility. The test strengths were compared with the theoretical strengths computed using the plastic stress distribution method. For analytical investigation, effective stress–strain models of the steel angle and concrete are proposed to account for the local buckling, spalling, and confinement. Through the strain-compatibility analysis based on the proposed models, the contributions of the angles, unconfined cover, and confined core to the compressive strength varying with deformation were investigated. Based on the investigation results, recommendations for the design and detailing of concrete-encased high-strength steel angle columns are given.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Research Foundation of Korea (2019R1F1A1059248 and 2018R1A6A1A070258).
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© 2021 American Society of Civil Engineers.
History
Received: Oct 7, 2019
Accepted: Sep 3, 2020
Published online: Jan 25, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 25, 2021
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