REVIEW ON ANALYTICAL STUDY ON STRENGTHENING OF BEAM BY FRP (original) (raw)
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Strengthening of Reinforced Concrete Beams using FRP Technique: A Review
Excessive fatigue deterioration is usually experienced when Reinforced Concrete structural elements are subjected to loadings. This emphasizes the desire to strengthen as well as improve the fatigue performance and extend the fatigue life of RC structural components particularly beams. During the last few decades, strengthening of concrete structural elements by fibre-reinforced polymer (FRP) has become a widely used technique where high strength is needed for carrying heavy loads or repairing is done due to fatigue cracking, failure modes and or corrosion. This paper reviews various aspects of RC beams strengthened with FRP. This topic has not been covered comprehensively in previous studies, whereas the technology has been modified rapidly in the recent past. It highlights aspects such as surface preparation, adhesive curing, finite element (FE) simulation, fatigue performance as well as the failure modes of RC beams retrofitted with FRP. This technique eliminates and or reduces the crack growth rate, delay initial cracking, decline the stiffness decay with residual deflection and extend the fatigue life of RC beams. The best strengthening option in this case is pre-stressed carbon fibre-reinforced polymer (CFRP).
Strengthening of reinforced concrete beams in flexural using FRP
Concrete design, 2021
This research is a summary of previous researchers work done in this area.Excessive fatigue deterioration is usually experienced when Reinforced Concrete structural elements are subjected to loadings. This emphasizes the desire to strengthen as well as improve the fatigue performance and extend the fatigue life of RC structural components particularly beams. During the last few decades, strengthening of concrete structural elements by fibre-reinforced polymer (FRP) has become a widely used technique where high strength is needed for carrying heavy loads or repairing is done due to fatigue cracking, failure modes and or corrosion. This paper reviews various aspects of RC beams strengthened with FRP. This topic has not been covered comprehensively in previous studies, whereas the technology has been modified rapidly in the recent past. It highlights aspects such as surface preparation, adhesive curing, finite element(FE) simulation, fatigue performance as well as the failure modes of RC beams retrofitted with FRP. This technique eliminates and or reduces the crack growth rate, delay initial cracking, decline the stiffness decay with residual deflection and extend the fatigue life of RC beams. The best strengthening option in this case is pre-stressed carbon fibre-reinforced polymer (CFRP)
Experimental and Analytical Study on Reinforced Concrete Beams in Bending Strengthened with FRP
The Open Construction and Building Technology Journal, 2014
The performance of the interface between fiber reinforced polymer (FRP) composites and concrete is one of the key factors affecting the behavior of strengthened reinforced concrete (RC) structures. Existing laboratory research has shown that RC beams strengthened with FRP sheets usually fail because of either debonding of the impregnated fabric from the concrete substrate or fracture of the FRP. This work presents an experimental and analytical investigation of the effectiveness of FRP strengthening sheets on RC beams aiming at increasing their flexural strength and stiffness. Experimental results obtained from beam specimens tested under four-point bending are examined with main parameters being the resin type and the anchoring system. In addition, the procedure suggested by the EC8 - Greek Assessment & Retrofitting Code (EC8-GARC) provisions is applied and compared with the experimental results.
2018
In this paper presents an experimental study conducted to examine the effectiveness of Fibre Reinforced Polymer (FRP) composites in enhancing the flexural capacity of concrete beams. In this study, Fibrereinforced polymer (FRP) application is a very effective way to repair and strengthen structures that have become structurally weak over their lifespan. Externally reinforced concrete beams with epoxy-bonded FRP sheets were tested to failure using a symmetrical two point concentrated static loading system. The results show that the FRP strengthened beams exhibit increased strength, deformation capacity, ductility and composite action until failure. Keywords-FRP, Epoxy Resin, Flexure, Two Point Static Loading System
In this paper presents an experimental study conducted to examine the effectiveness of Fibre Reinforced Polymer (FRP) composites in enhancing the flexural capacity of concrete beams. In this study, Fibrereinforced polymer (FRP) application is a very effective way to repair and strengthen structures that have become structurally weak over their lifespan. Externally reinforced concrete beams with epoxy-bonded FRP sheets were tested to failure using a symmetrical two point concentrated static loading system. The results show that the FRP strengthened beams exhibit increased strength, deformation capacity, ductility and composite action until failure.
Analytical study of the section of the rc beams strengthened for flexure with FRP materials
Facta universitatis - series: Architecture and Civil Engineering, 2021
Strengthening of concrete structures is applied as a solution for various deterioration problems in civil engineering practice. This paper presents an analytical study of the behaviour of cross-section of reinforced concrete (RC) beam, strengthened for flexure with fiber reinforced polymer (FRP) materials. Using the balance of internal forces in the cross section through all phases of stress through which the section passes, a program was written in the MATLsoftware, the execution of which produced a curve of dependence between bending moment and curvature, which is one of the most important indicators of cross section behaviour. The parameters varied in this study are the amount and type of FRP reinforcement and the obtained results indicate a significant influence of additional FRP reinforcement both on the yielding and ultimate bending moment, and on the bending stiffness of the strengthened cross section.
Performance Analysis of Reinforced Concrete Beam with GFRP Using Finite Element Method
International Journal of Application on Sciences, Technology and Engineering
Structural strengthening is required when structures suffer from minor damage or strength degradation. Structural strength degradation can be caused by incorrect initial design, structural age, environmental factors, or changes of building functions. One of the strengthening solutions is Glass Fiber Reinforced Рolymer (GFRР) due to its easy application and good mechanical properties such as. This research discussed the effect of externally bonded GFRР sheets on the flexural capacity of reinforced concrete beams. The concrete specimens had dimensions of 150×250×3300 mm and were simply supported beams tested using two point symmetrical loading. Flexural strengthening was done by applying GFRР sheets to the bottom side of the beams (bottom wrapping). Flexural capacity analysis was done using finite element method with the help of MIDAS FEA program and shows 27,915-70,521% flexural capacity increasement for each GFRP layer addition for bottom wrapping models. Finite element analysis res...
This paper presents a summary of our investigations that were aimed to assess the influence of various physical and mechanical parameters on the performance of reinforced concrete (RC) beams strengthened with fiber reinforced plastic (FRP) plates. The work was divided into two phases. The first phase investigated the influence of FRP plate length, fiber orientation, and surface preparation on the performance of FRP-reinforced RC beams. The FRP in this phase of the work was E-glass/epoxy. The second phase of the study was designed to confirm the validity of our hypothesis, which postulated that the delamination of the FRP plate would be a function of the Poisson ratio mismatch between concrete and FRP plate. Results from the second phase also suggested that less expensive glass FRP plates could adequately replace the more expensive carbon FRP plates by offering the beam more ductility, without sacrificing its expected performance. Moreover, results from both phases showed that the lateral stiffness of the FRP plate contributed to the overall flexural stiffness of the strengthened beam.