Retrofitting of reinforced concrete beams using composite laminates

Construction and Building Materials (Impact Factor: 2.3). 02/2011; 25(2):591-597. DOI: 10.1016/j.conbuildmat.2010.06.082


This paper presents the results of an experimental study to investigate the behaviour of structurally damaged full-scale reinforced concrete beams retrofitted with CFRP laminates in shear or in flexure. The main variables considered were the internal reinforcement ratio, position of retrofitting and the length of CFRP. The experimental results, generally, indicate that beams retrofitted in shear and flexure by using CFRP laminates are structurally efficient and are restored to stiffness and strength values nearly equal to or greater than those of the control beams. It was found that the efficiency of the strengthening technique by CFRP in flexure varied depending on the length. The main failure mode in the experimental work was plate debonding in retrofitted beams.

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Available from: Ghazi A. F. R. Abu-Farsakh
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    • "Using external CFRP strips to enhance the flexural behavior of reinforced concrete beams has been investigated thoroughly by many researchers [1] [2] [3] [4]. In addition, shear and torsional strengthening of beams improved significantly through experimental and analytical studies [5] [6] [7]. Moreover, fatigue resistance of concrete elements strengthened with CFRP materials evaluated by experimental tests and numerical methods greatly [8] [9]. "
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    ABSTRACT: Utilizing Carbon Fiber Reinforced Polymer (CFRP) composites for repairing, strengthening and upgrading concrete structures has been a very successful technique in recent years. Previous studies confirmed bonding CFRP plate to the concrete elements increased the mechanical performance such as flexural and shear resistance. However, the long-term bond integrity performance needs to be investigated further, focusing especially on the bond interfaces in various environmental conditions. In addition, little literature exists about the durability of the system in tropical climate. The current investigation is concerned with the behavior of concrete/CFRP bonding system in various environmental conditions focused on natural tropical climate which is an extremely hot/wet environment. Concrete/CFRP double lap joints prepared and subjected to diverse exposures. Pull-out tests conducted and the bonding characteristics investigated in detail. The results demonstrated the average bond strength of specimens subjected to tropical outdoor condition for 6 months deteriorated slightly.
    Full-text · Article · Feb 2015 · Construction and Building Materials
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    • "Similarly, as the length of CFRP increased the beam strength increased due to attainment of proper anchorage. Strength increased but brittle failure was reported by delaminating bottom strip [11]. The performance of high strength fibre (Flexible wraps) U-shape wrap was studied by El-Ghandour. "
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    ABSTRACT: RC beams as a structural member contain a variety of non-uniform loads. These non-uniform loads caused combined effects of flexure and torsion. There are numerous studies available, that suggests different strengthening schemes using FRP laminates, as a solution for flexure and torsion deficient beams. Most of the experimental studies suggested individual strengthening schemes for flexure or torsional deficiency RC beams. However, the combined effects were not studied due to difference in experimental setup, testing procedure and specimen detailing. Therefore, the outcome of previous studies was needed to combine together to facilitate the strengthening process as a guideline case of such deficiency. Therefore, a combined review is presented by suggesting different configuration for flexure and torsion deficient RC beams. Most of the studies suggested that the application of FRP laminates at the soffit of beam is suitable for flexural strengthening. The application of U-shape or full wrap are suitable for strengthen torsion deficient beams. Similarly, 45° wraps are more effective than 90°wraps for improving ductility of torsion deficient beams.
    Full-text · Article · Jun 2014
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