FRPreinforced

FRPreinforced is a designation used to describe the reinforcement of structures with fiber-reinforced polymer (FRP) composites. The term covers internal reinforcement with FRP bars or fabrics, externally bonded strengthening systems, and prestressing applications across civil, mechanical, and marine engineering contexts.

FRP materials include carbon fiber reinforced polymer (CFRP), glass fiber reinforced polymer (GFRP), and aramid-reinforced polymers (AFRP). They offer high tensile strength, low density, and excellent resistance to corrosion and chemicals, though performance depends on fiber type, resin matrix, and environmental exposure.

Construction and retrofit methods: FRP can be used as embedded reinforcement via pultruded bars, as externally bonded sheets or wraps for retrofitting, or as prestressing tendons. Adhesive bonding to concrete is common, with surface preparation and protection from moisture critical for durability.

Applications: strengthening of reinforced concrete beams and columns, bridge retrofits in aggressive environments, marine structures, and lightweight components in aerospace and automotive sectors. FRP is valued where steel reinforcement would corrode or add excessive weight.

Design and standards: FRP reinforcement is guided by standards such as ACI 440 series in the United States and corresponding international guidelines, which address material properties, serviceability, bond, debonding, and long-term durability.

Limitations: higher material costs, sensitivity to high temperatures and UV (for some resins), creep under sustained loads, and complex long-term behavior requiring careful assessment and monitoring.