Structural Behavior of Slender High-Strength RC Columns Strengthened by Steel Angles
Publication: Practice Periodical on Structural Design and Construction
Volume 23, Issue 4
Abstract
This article presents an experimental and analytical study related to the structural behavior of slender RC columns with normal-strength concrete (NSC) and high-strength concrete (HSC) strengthened by steel angles and battens. Twelve specimens of slender RC columns were tested, which differed in terms of the compressive strength of the concrete, reinforcement ratio, and spacing between battens. Furthermore, the axial load was applied in the experimental test with three different eccentricities (0, 20, and 40 mm). The structural behavior of the columns, such as the deflection, ultimate load, and mode of failure, was found to be significantly influenced by the strengthening. The ultimate load was increased by 50.43, 79.49, and 86.32% for the spacing between battens of 432, 288, and 192 mm, respectively, when compared with the unstrengthened column, which had 20-mm eccentricity. The ultimate load was increased by 42.86% for 192 mm, compared with the unstrengthened column, which had zero eccentricity. New analytical formulas were derived based on equilibrium equations and strain compatibility to estimate the ultimate load of slender columns with or without strengthening. The difference range in the ultimate load between the proposed formulas and experimental results of the current work and many previous researchers was 0.3–24.9%, and the average was 7.05%.
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Published In
Practice Periodical on Structural Design and Construction
Volume 23 • Issue 4 • November 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Feb 26, 2018
Accepted: May 14, 2018
Published online: Aug 22, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 22, 2019
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