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This paper reports on the key features of the “Guide for the Design and Construction of Concrete Reinforced with FRP Bars” issued by the American Concrete Institute (ACI). For new construction, FRP bars have been used as the internal reinforcement in concrete members to replace conventional steel rebars fora host of reasons. The principles for design and construction were first established and proposed to industry in 2001. The third revision of the guide is now under preparation. Design procedures account for a lack of ductility in concrete reinforced with FRP bars. An FRP-RC member is designed based on its required strength and then checked for serviceability and ultimate state criteria (e.g., crack width, deflection, fatigue and creep rupture endurance). When using FRP as shear reinforcement, one needs to recognize that: FRP has a relatively low modulus of elasticity; FRP has a high tensile strength and no yield point; tensile strength of the bent portion of an FRP bar is significantly lower than the straight portion; and FRP has low dowel resistance. The use of GFRP bars for reinforcing concrete bridge decks has captured some interest, particularly for the case of the replacement of the top steel mat. The idea is to eliminate one of the major causes of deterioration (i.e., the steel reinforcement embedded in the concrete region more exposed to chlorides) without significantly increasing cost of construction and without totally removing steel reinforcement.
Tags:concrete bridge decks, american concrete institute, modulus of elasticity, shear reinforcement, frp bars
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