EFFICIENCY OF USING CFRP COVERED AREA RATIO ON BEAM SHEAR CAPACITY

Document Type : Original Article

Authors

Civil Engineering Department, Faculty of Engineering, Al-Azhar University, Cairo, Egypt.

Abstract

Shear failure is a critical concern in reinforced concrete structures. Failure occurs suddenly without any warning. In this study, a comprehensive finite element modeling using ANSYS (V17.0) software approach to assess the efficiency of using carbon fiber (CFRP) for RC beams was investigated. The dimensions of RC simply supported beams were 120 mm width, 400 mm thickness. Four different length-to-thickness ratios, 3, 4, 5 and 6 have been considered. Different covered area of CFRP was applied to RC beam to improve beam shear capacity. Four different percentages of CFRP, 12.5%, 25%, 37.5% and 50% related to effective shear zone area have been studied. CFRP were wrapped around the beam in a U-shape with anchors. Vertical deflection, failure load, von mises stress and stress in the stirrups have been obtained. The analysis of results showed that the use of CFRP significantly improves the ductility and performance of RC beams. CFRP strengthening can shift the failure mode from shear to flexure, especially in beams with longer shear spans. This failure occurs in the flexure zone due to compression in the concrete, allowing them to undergo larger deformations before failure. Increasing the CFRP coverage from 12.5% to 50% for beams with L/T ratio from 3 to 6 leads to an improvement in shear capacity ranging from 21.2% to 150%.

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Journal of Al-Azhar University Engineering Sector
Volume 20, Issue 74
January 2025
Pages 32-58

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