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Structural Engineering and Mechanics Volume 87, Number 6, September25 2023 , pages 585-599 DOI: https://doi.org/10.12989/sem.2023.87.6.585 |
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Efficient repair of damaged FRP-reinforced geopolymeric columns using carbon fiber reinforced polymers |
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Mohamed Hechmi El Ouni, Ali Raza and Khawar Ali
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| Abstract | ||
| Geopolymer concrete (GC) can be competently utilized as a practical replacement for cement to prevent a high carbon footprint and to give a direction toward sustainable concrete construction. Moreover, previous studies mostly focused on the axial response of glass fiber reinforced polymer (glass-FRP) concrete compressive elements without determining the effectiveness of repairing them after their partial damage. The goal of this study is to assess the structural effectiveness of partially damaged GC columns that have been restored using carbon fiber reinforced polymer (carbon-FRP). Bars made of glass-FRP and helix made of glass-FRP are used to reinforce these columns. For comparative study, six of the twelve circular specimens-each measuring 300 mmx1200 mm-are reinforced with steel bars, while the other four are axially strengthened using glass-FRP bars (referred to as GSG columns). The broken columns are repaired and strengthened using carbon-FRP sheets after the specimens have been subjected to concentric and eccentric compression until a 30% loss in axial strength is attained in the post-peak phase. The study investigates the effects of various variables on important response metrics like axial strength, axial deflection, load-deflection response, stiffness index, strength index, ductility index, and damage response. These variables include concentric and eccentric compression, helix pitch, steel bars, carbon-FRP wrapping, and glass-FRP bars. Both before and after the quick repair process, these metrics are evaluated. The results of the investigation show that the axial strengths of the reconstructed SSG and GSG columns are, respectively, 15.3% and 20.9% higher than those of their original counterparts. In addition, compared to their SSG counterparts, the repaired GSG samples exhibit an improvement in average ductility indices of 2.92% and a drop in average stiffness indices of 3.2%. | ||
| Key Words | ||
| axial deflection; carbon-FRP sheets; geopolymer concrete; glass-FRP helix; strength index | ||
| Address | ||
| Mohamed Hechmi El Ouni: Department of Civil Engineering, College of Engineering, King Khalid University, PO Box 394, Abha 61411, Saudi Arabia Ali Raza, Khawar Ali: Department of Civil Engineering, University of Engineering and Technology Taxila, 47050, Pakistan | ||