Sayan Sirimontree1 , Suraparb Keawsawasvong1 , and Chanachai Thongchom This email address is being protected from spambots. You need JavaScript enabled to view it.1

1Department of Civil Engineering, Thammasat School of Engineering, Thammasat University, Pathumthani 12120, Thailand


Received: November 29, 2020
Accepted: January 1, 2021
Publication Date: June 1, 2021

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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This paper presents an experimental study on reinforced concrete columns strengthened with prestressed steel straps. A total of five specimens is constructed. A cross-section of all specimens is 150x150 millimeters. A height of all specimens is 1.20 meters. A studied variable is a spacing of steel straps, which are 150 and 75 millimeters. All columns are subjected to a compressive force without an eccentric load. The experimental data is recorded in the term of the load-deformation relationships, and also modes of failure. Based on the experimental data, the reinforced concrete column strengthened with steel straps can enhance the axial load bearing capacity by 30 to 33 percent and can increase the ductility by 71 to 118 percent. A spacing of steel straps has no significant influence on an axial load bearing capacity, but it affects the ductility when compared to the control specimen.

Keywords: Column, Steel strap, Confinement, Reinforced concrete, Strengthening


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