International Journal of Civil and Structural Engineering Research ISSN 2348-7607 (Online) Vol. 10, Issue 2, pp: (56-62), Month: October 2022 - March 2023, Available at: www.researchpublish.com
STUDY THE PERFORMANCE OF REINFORCED CONCRETE BEAMS STRENGTHENED BY SIDE BONDED CFRP Ahmed Abd ELTawab1, Magdy Genidi2 , Mohamed H. Agamy3, Abdeldayem Hadhood4 1,2,3,4Civil Engineering, 1,2,3,4
Faculty of Engineering El-Mattaria, Helwan University Helwan, Egypt. DOI: https://doi.org/10.5281/zenodo.7446322
Published Date: 16-December-2022
Abstract: This study's primary goal is to discuss the impact of the shear strengthening of Confined concrete beams and compare with control unstrengthened specimen to show the impact of side bonded beams retrofitting externally by Cfrp. Beams are designed to show also size effect impact. Two concrete beams were casted at the laboratory with concrete dimension of 180*40*2200mm while casted concrete strength of 30 MPa with 5Φ22 Bottom Reinforcement and 3Φ16 Top Reinforcement while the web reinforcement of T8 Spaced at 150mm.beams are tested under a/d radio of 2. The first beam used as a control beam without strengthening, and the other beam that are externally strengthened with CFRP strips with full height spaced at 150 mm and leaved for 28 days to gain full strength of epoxy resin as per the manufacturer data sheet before testing the beams. Each of these beams was tested with a particular span-depth ratio under a single point of loading until it failed in shear. Keywords: CFRP, debonding, shear strengthening and concrete beams.
I. INTRODUCTION Both reinforced and prestressed concrete members typically fail in a shear failure that is abrupt and brittle. It must be taken into account that the shear strength must be equal to or greater than the flexural strength. Therefore, the cross-sectional area and flexural reinforcement were initially determined by the flexural design. The concrete beams are then shear strengthened to prevent shear failure rather than flexural failure. The majority of shear design codes divided the concrete contribution (Vc) and the shear reinforcement contribution into two parts for the shear strength designs of reinforced concrete members (Vs). Based on the sum of the two terms while taking safety considerations, The use of externally bonded (EB) fiberreinforced polymer (FRP) composites to enhance degraded reinforced concrete (RC) structures is currently regarded as one of the most common strengthening techniques for enhancing the structural performance of concrete structures. This is because FRP composites, especially carbon fiber (CFRP), have extraordinary features such as high tensile modulus, high strength to weight ratio, high corrosion resistance, and excellent efficiency throughout the strengthening process. Epoxy is commonly utilized in a number of mounting techniques, such as full wrapping, U-wrapping, and side bonding, to attach the FRP Strips to a surface. Strips of side-bonded FRP may be left exposed in order to bolster the bond and maximize the material's shear contribution. Full-wrapping is more productive but less practical in solid slabs when the slab needs to be slotted. Not always the most cost-effective solution Since it only requires access to the sides and bottom of a beam, the Uwrapping design is perhaps the one that is most frequently utilized. There has been a lot of interest in undertaking more study recently. Even though full-wrapping is more efficient and does not require the slab to be slotted, it cannot be the most cost-effective option for solid slabs. Since it only needs access to a beam's sides and bottom, the U-wrapping design is perhaps the most popular. Recently, there has been a lot of interest in looking further into the shear behaviour of RCstrengthened beams that have either side-bonded FRP configurations or U-wrapping [7–12], in order to provide guidance
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