LONG-TERM BEHAVIOR OF REINFORCED CONCRETE BEAMS WITH CARBON FIBER REINFORCED POLYMER (CFRP) COMPOSITES UNDER SUSTAINED LOADS

摘要

Carbon Fiber Reinforced Polymer (CFRP) composites has recently been recognized as an alternative to conventional steel reinforcement in concrete due to its excellent resistance to corrosion. Four rectangular concrete beams reinforced with CRFP bars were cast for the study of the long-term behavior under uniform sustained loading. The beams were simply supported and subjected to uniform sustained loading. The beams were instrumented and monitored to observe the change in the behavior due to the creep and shrinkage of concrete. An analytical method is developed to predict the long-term behavior of CFRP reinforced concrete beams. The calculated deformations compare reasonably with the experimental values. A modified equation for the calculation of the long-term deflection is proposed for CFRP reinforced concrete beams. A simplified equation for the calculation of the creep coefficient is also proposed.