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Computers and Concrete Volume 31, Number 3, March 2023 , pages 173-184 DOI: https://doi.org/10.12989/cac.2023.31.3.173 |
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Numerical assessment of rectangular one- and two-way RC slabs strengthened with CFRP under impact loads |
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Mohamed Emara, Ahmed Hamoda and Jong Wan Hu
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| Abstract | ||
| In this study, the flexural behaviors of one- and two-way reinforced concrete (RC) slabs strengthened with carbonfiber- reinforced polymer (CFRP) strips under impact loads were investigated. The flexural strengthening of RC slabs under simulated static monotonic loads has been comprehensively studied. However, the flexural behavior of RC slabs strengthened with CFRP strips has not been investigated extensively, particularly those conducted numerically. Nonlinear three-dimensional finite element models were developed, executed, and verified against previous experimental results, producing satisfactory models with approximately 4% error. The models were extended to a parametric study, considering three geometric parameters: the slab rectangularity ratio, CFRP strip width, and CFRP strip configuration. Finally, the main results were used to derive a new formula for predicting the total deflection of RC slabs strengthened with CFRP strips under impact loads with an error of approximately 10%. The proposed equation reflected the slab rectangularity, CFRP strip width, equivalent slab stiffness, and dropped weight. Results indicated that the use of CFRP strips enhanced the overall impact performance, the wider the CFRP width, the better the enhancement. Moreover, the application of diagonally oriented CFRP strips diminished the cracking zone compared to straight strips. Additionally, the diagonal orientation of CFRP strips was more efficient for two-way slabs while the vertical orientation was found to be better in the case of one-way slabs. | ||
| Key Words | ||
| CFRP; finite element; low-velocity impact; RC slab; strengthening | ||
| Address | ||
| Mohamed Emara: 1) Structural Engineering Department, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt, 2) Civil Engineering Department, Delta Higher Institute for Engineering and Technology, Mansoura, Egypt Ahmed Hamoda: Civil Engineering Department, Faculty of Engineering, Kafrelsheikh University, Kafrelsheikh, Egypt Jong Wan Hu: 1) Department of Civil and Environmental Engineering, Incheon National University, Incheon 22012, Korea, 2) Incheon Disaster Prevention Research Center, Incheon National University, Incheon 22012, Korea | ||