Abstract
In this research, the finite element method is used to develop a numerical model to analyse the effect of the external strengthening of reinforced concrete beams by using carbon Fiber Reinforced Polymer (CFRP) sheets. A finite element model has been developed to investigate the behavior of RC beams strengthened with CFRP sheets by testing nineteen externally simple R.C. beams, tested under a four-point load setup until failure. Various CFRP systems were used to strengthen the specimens. The numerical results using the (ANSYS workbench v.19.1) were calibrated and validated with the experimental results. The research results indicate a significant improvement in the structural behavior of the specimens strengthened using CFRP sheet systems. Then the validated model investigated the effect of the width of CFRP sheets, no of layers, and CFRP size on the behavior of strengthened R.C. beams. Results of this numerical investigation show the effectiveness of increase CFRP width to improve the flexural capacity of R.C. beams. An increase in the flexural capacity up to 100 % compared to the control beam.
Highlights
Over the past decades, (FRP) has been commonly used to repair and rehabilitate civil structures, showing signs of aging degradation and distress. (CFRP) is a brittle material that typically fails at a lower load level
Bennegadi et al [14] developed a numerical model for optimization of reinforced concrete beams by external (HFRP) plate, and they found that the ultimate load of the reinforced concrete beam was increased when compared to the reference beam, the geometrical and mechanical properties of the HFRP plate must be optimized
A total of nineteen FE models were developed to study the flexural behavior of RC beams externally bonded with carbon Fiber Reinforced Polymer (CFRP) sheets. ten specimens were used to validate the accuracy of the numerical model by comparing it with experimental results by Madqour et al.[20] and nine models were developed to investigate the effect of increasing CFRP sheets size
Summary
Over the past decades, (FRP) has been commonly used to repair and rehabilitate civil structures, showing signs of aging degradation and distress. (CFRP) is a brittle material that typically fails at a lower load level (i.e., horizontal crack propagation or debonding). Lusis et al [12] investigated the influence of insertion of short fibers on reinforced concrete's mechanical characteristics using a series of experiments and numerical analysis They had a significant effect on the tensile strength of the structure. Narmashiri et al [17] conducted more experimental and numerical research on CFRP-reinforced steel I-beams in terms of failure analysis and structural behavior. They concluded that the geometric and mechanical characteristics control the loadbearing capacity of CFRP plates. Ten specimens were used to validate the accuracy of the numerical model by comparing it with experimental results by Madqour et al.[20] and nine models were developed to investigate the effect of increasing CFRP sheets size A total of nineteen FE models were developed to study the flexural behavior of RC beams externally bonded with CFRP sheets. ten specimens were used to validate the accuracy of the numerical model by comparing it with experimental results by Madqour et al.[20] and nine models were developed to investigate the effect of increasing CFRP sheets size
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