Abstract
FRP rods as lightweight materials with extraordinary properties of high strength to weight ratio, corrosion resistance, potentially high overall durability, tailor ability and high specific attributes are one of the most favorable materials to strengthen existing reinforced structures. The present study aimed to identify the behavior of reinforced concrete flexural beams strengthened with fiber reinforced polymer (FRP) rods through near surface mounted method (NSM). The results of the current study were based on nonlinear finite element software ABAQUS which can accurately simulate the experimental investigations on flexural behavior of reinforced concrete beams strengthened with NSM FRP rods. Validation of the proposed model was confirmed first by making a comparison with the experimental study presented in the literature. A parametric analysis was conducted on validated specimens to investigate the effect of FRP rod diameters, rod arrangements, FRP materials, as well as rods groove intervals on flexural behavior of strengthened reinforced beams. The numerical results of mid-span bending moment deflection, ultimate bending moment, failure deflection and ductility index were reported. For the sake of simplicity to be used by engineers, the results of the current study were drawn in the form of design charts and tables.
Highlights
The apprehensive statistics of human losses and financial casualties induced by poor performance of existing structures have doubled the importance of urgent demand to strengthen reinforced concrete structures due to either a change in use or structural degradation
The aim of this study is to investigate flexural strengthening of reinforced concrete beams with near surface mounted fiber reinforced polymer (FRP) bars
In order to apprise the validity of the finite element model results of the reinforced concrete beam with near surface mounted (NSM) FRP rods to those obtained by experimental study of Al-Mahmud et al (2009), a comparison was made on bending moment mid-span versus deflection between numerical simulation and experimental results of strengthening beams
Summary
The apprehensive statistics of human losses and financial casualties induced by poor performance of existing structures have doubled the importance of urgent demand to strengthen reinforced concrete structures due to either a change in use or structural degradation. Deterioration of concrete, bars corrosion, physical damages, aging of concrete structures, upgrading the design standard codes, exposure of unpredictable loads such as sever strong earthquakes and shock loads, committing imperfections and errors in design and construction procedures, and changes in the use of a structure are some of the most well-known reasons of strengthening reinforced concrete structures among many [1,2,3]. All of these broad classifications of structural deficiency can be addressed using FRP composites. The fiber reinforced polymer (FRP) composites as strengthening materials have the advantages of the minimal increase in the dead load of structure, high strength to weight ratio, corrosion resistance, and durability performance which enable them to be used in areas
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