The role of changes in internal and external cross-section geometry on the compressive strength of hollow concrete confined with CFRP sheets

Articles in Press

Authors

1 Associate Professor, Department of Civil Engineering, Shahid Nikbakht Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran.

2 Department of Civil Engineering, Sirjan University Of Technology, Sirjan, Iran

3 Master's Degree Graduated in Department of Civil Engineering, Shahid Nikbakht Faculty of Engineering, University of Sistan and Baluchestan, Zahedan, Iran.

10.22034/ceej.2025.65702.2415

Abstract

Columns are the main components of structures and sometimes they need to be strengthened due to various reasons such as the change of use of the building, errors in the design, changes in regulations and errors in concrete construction. The use of fiber-reinforced-polymers (FRP) for strengthening is increasing day by day, due to their properties. In this research, the confining effect of CFRP on the compressive strength of hollow concrete columns is experimentally investigated. In order to investigate the effect of internal and external geometry of the hollow section on the compressive strength of concrete confined with CFRP, 45 experimental specimens were made. The variables of this study are: external cross-section (circle, square and rectangle), internal cross-section (circle and square with different dimensions) and the number of confining layers of CFRP (zero, one and two layers). In general, the results show that confining hollow concrete using CFRP confinement increases the compressive strength. Confinement has the greatest effect on specimens with the external and internal cross section of the circle with the internal diameter of 75 mm; So that the addition of 1 and 2 layers of CFRP increases the compressive strength by 84 and 108 percent, respectively, compared to the corresponding specimen without confinement, and the least confinement effect is on the square specimen with a square internal section with a side of 60 mm; So that adding 1 and 2 layers of CFRP increases the compressive strength by 3 and 12 percent, respectively, compared to corresponding specimen without confinement.

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Journal of Civil and Environmental Engineering

Articles in Press, Accepted Manuscript
Available Online from 22 July 2025

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