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Structural Engineering and Mechanics Volume 93, Number 2, January25 2025 , pages 135-145 DOI: https://doi.org/10.12989/sem.2025.93.2.135 |
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Experimental and numerical investigation of RC column strengthening by FRPs with different numbers of layer and elongation under eccentric loading |
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Mostafa Habibpour, Jafar Asgari Marnani, Abolfazl Arabzadeh and Abbas Ghasemi
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| Abstract | ||
| One of the most effective methods for strengthening reinforced concrete columns is applying all-round FRP composite external coatings. This method significantly enhances the bearing capacity and ductility of the columns. With the eccentricity of the load and curvature in the columns, the direction of the FRP fibers will also be important in strengthening. In this study, 20 circular reinforced concrete columns were examined by considering the three variables: the direction of composite fibers, number of composite layers, and value of eccentricity of the load. Nine columns were experimentally examined with 11 numerical models analyzed using ABAQUS finite element software. The specimens were classified into two groups, eccentricity value of the load equal to the radius of the column (R) and three times the radius of the column (3R). In each group, the direction of FRP fibers was considered as 0o, 45o, and 90o in relation to the transverse axis of the columns. The numbers of composite layers were also considered as two and three layers. The results revealed in the state of loading with R eccentricity value, the composites are more suitable to be directed at 0o or 90o for strengthening. While loading with 3R eccentricity, use of only 90o composites had the greatest impact on the bearing strength and ductility of columns. Increasing the number of composite layers boosted the bearing capacity and reduced ductility of the columns. Also, the effect of 45o FRPs in loading with R eccentricity is greater than those with 3R. | ||
| Key Words | ||
| ductility; eccentricity of the loading; fiber elongation; FRP composite; reinforced concrete column; strengthening | ||
| Address | ||
| Mostafa Habibpour, Jafar Asgari Marnani, Abbas Ghasemi: Faculty of Civil and Earth Resources Engineering, Department of Structure, Islamic Azad University, Central Tehran Branch, Iran Abolfazl Arabzadeh: Faculty of Civil Engineering and Environment, Department of Structure, Tarbiat Modares University of Iran, Iran | ||