Performance of Reinforced Concrete Beams Strengthened by Bidirectional Carbon-Fiber-Reinforced Polymers Based on Numerical Models

Abstract

The use of carbon-fiber-reinforced polymers (CFRPs) for the repair and rehabilitation of reinforced concrete (RC) structures has been receiving a lot of attention. Specifically, the shear strengthening of RC members based on CFRP materials has been treated as an effective and efficient strengthening method. Previous research projects focused on the shear strengthening of RC members with unidirectional CFRP strips. Although the effectiveness of a bidirectional CFRP layout compared to a unidirectional CFRP layout was discussed in several studies, these studies only investigated the issue based on experiments. Morever, the parameters of the bidirectional CFRP layout were not clearly defined. This study investigates the performance of RC beams strengthened by bidirectional CFRP based on numerical models. A numerical model based on finite element analysis is designed. Using the numerical model, the parameters of the horizontal CFRP strips, such as the layouts of horizontal CFRP strips and the number of horizontal CFRP strips, are studied. The results show that the effect of horizontal CFRP strips is maximized if the strips are distributed along the depth. In contrast, the number of horizontal CFRP strips does not significantly affect the shear strength of RC members.

Numerical Modeling and Performance Evaluation of Carbon Fiber-Reinforced Polymer-Strengthened Concrete Culverts against Water-Induced Corrosion

“…The idea of using CFRP strengthening techniques including CFRP sheets is common in structural elements, such as beams and others [16,[25][26][27]. Moon et al [25] examined RC beams with unidirectional/bidirectional CFRP layouts and wrapped CFRP strips. Their analyses revealed that bidirectional CFRP provides better performance compared to unidirectional CFRP.…”

Experimental Investigation on the Use of Crumb Rubber as Partial Replacement of Coarse Aggregate in Concrete Incorporating Cement Replacement Materials

“…Previous studies revealed that the use of recycled waste in the production of new concrete raises significant concerns about the quality of the concrete produced. To maintain the desired mechanical properties, the strengthened methods were used, such as hemp fiber rope (HFR) [11], glass fiber chopped strand mat (FCSM) sheets [12], hemp-fiberreinforced polymer (HFRP) composites [13], and comparison LC-GFRP (low-cost glass-fiberreinforced polymer) with carbon/sisal fiberreinforced polymer [14].…”