FRP reinforcement for durable concrete structures

Abstract

Although the use of fibre reinforced polymer (FRP) reinforcement for the strengthening and rehabilitation of existing structures has been well accepted within the construction industry, their adoption as internal reinforcement in new buildings has been considerably slower. The reason for the limited use of FRPs as internal reinforcement can be attributed to their initial higher material casts and unique mechanical properties, the perception of which generally overwhelms contractors and designers who rather deal with the more familiar steel reinforcement. In addition, the Jack of a mature set of design rules also contributs to the delay the more widespread adoption of this new technology. FRP reinforcement can offer improved structural performance along with superior durability characteristics. In addition, composites can be engineered to have exceptional resistance to environmental factors such as freeze-thaw cycles, chemical attack and temperature variations. This paper will draw on the ongoing work of fib TG 9.3 on FRP Reinforcement for Concrete Structures, and present some of the important aspects of structural behaviour and philosophy focusing primarily on flexural capacity, deflections, cracking, shear and bond.