Introduction to Externally Bonded FRP
Externally bonded Fiber-Reinforced Polymer (FRP) systems have revolutionised the approach to reinforcing concrete structures. Among various materials, carbon fiber reinforced laminates have proved their effectiveness in enhancing the flexural capacity of singly reinforced sections in concrete. This approach, guided by standards such as ACI 440.2R-17, offers innovative solutions for structural engineers.
Why Use Fiber Reinforced Laminates?
Carbon fiber reinforced laminates (CFRP) stand out for their lightweight nature and high tensile strength. These materials provide excellent bonding characteristics when applied to existing concrete structures. As a result, CFRP systems significantly improve the flexural capacity of singly reinforced concrete sections, making them ideal for renovation and reinforcement projects. It is important to note that a major drawback is the potential for introducing brittle failure modes to a ductile element. Care should be taken in both the design and detailing of members strengthened with FRP laminates. The example below is for a singly reinforced concrete section, strengthened by bonding an FRP laminate to the tensile soffit.
