Abstract
Using fibre-reinforced polymer (FRP) in the concrete structures was rapidly increased throughout the past two decades. Corrosion-free properties and the high ratio of strength-to-weight of the FRP reinforcement has led to the significant increase of structures’ service life. In the present work, the earlier studies that are associated with shear behaviour of the beams that have been reinforced by the FRP bars are reviewed. Many researchers have investigated shear behavior of the beams of concrete that have been reinforced by the FRP bars and determined their capacity. Some of them have per-formed experimental investigations through the testing of several beams with varying some of the parameters, whereas the others have been theoretical for estimating shear capacity of the beam. This study presents as well, a review for all of the codes and researcher equations for shear design of the beams that have been rein-forced by the FRP bars.
Highlights
The deteriorations of the concrete structures as a result of steel reinforcement corrosion resulted in the emergence of the necessity for alternative reinforcement type, like the fibre-reinforced polymer (FRP).Stirrups that are utilized for the shear reinforcement are located typically as external reinforcement based on flexural reinforcement, which is why; they have higher susceptibility to the severe environmental factors, because of minimum concrete cover that has been provided
A specimen with the GFRP plate with 3x2 opening array has shown the maximum value of the shear strength, the test included 6 type A, 1 type B, and 1 type C (Figure1).They found that the height and width of an opening have to be larger than 100 mm, and the openings’ area ratio has to be higher than 50% for the purpose of obtaining an effective shear performance, 3 different results from 3 different reinforcing plate shapes have shown that the increase of bonded area between concrete and GFRP plate results in increasing shear reinforcement efficiency
The present work has shown that the predictions of shear strength of the FRP reinforced beams with and with no stirrups of the FRP have been in agreement with the shear properties of the reinforced concrete beams with other bars of FRP (CFRP, AFRP and GFRP)
Summary
The deteriorations of the concrete structures as a result of steel reinforcement corrosion resulted in the emergence of the necessity for alternative reinforcement type, like the FRP. The FRP can be defined as corrosion-free materials and were utilized lately as reinforcements for avoiding concrete structure deteriorations, which result from the steel reinforcement corrosion. Numerous analytical and experimental research programs were carried out for investigating flexural behavior of the concrete members reinforced and/or prestressed by the reinforcement of FRP. The reinforced and pre-stressed concrete member flexural behaviors were studied thoroughly and rationalized to simple equations of compatibility and equilibrium in the majority of current codes. Shear failure of reinforced and pre-stressed members of concrete is disastrous in nature, which is why, a considerable safety margin is normally utilized. In the case where the shear reinforcement has not been provided suitably for the pre-stressed or reinforced beams of concrete, shear failure will possibly occur suddenly, and with no prior distress warning. A detailed review has been provided by ASCE-ACI Task Committee 426 (1973) [8-19]
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