Finite element modelling of RC beam strengthened with epoxy-bonded steel plate

Abstract This study investigates the effectiveness of epoxy-bonded steel plates for flexural retrofitting of reinforced concrete beams, focusing on improving load capacity and stiffness while mitigating debonding and premature failure. A numerical model was developed in Abaqus and validated using existing experimental data. The model was then used to analyse a retrofitted beam, varying steel plate thickness, width, and length. Results showed that the strengthening technique effectively increased the beam’s flexural capacity and stiffness. The plate thickness significantly influenced pre-cracking load capacity and stiffness, with a 3 mm plate demonstrating optimal performance. Thicker plates (greater than 3 mm) were more susceptible to debonding, leading to decreased load capacity and increased risk of premature failure. Increasing the plate length and width resulted in corresponding increases in load capacity and stiffness.