The investigation revealed that the beams reinforced with CFRP bars and spirals exhibited high load-carrying capacity and performance comparable with that of the control beam reinforced with steel. The test parameters included the type of reinforcement (CFRP versus steel) and the ratio of shear reinforcement (spiral spacing). A total of five full-scale concrete beams with a total length of 3,000 mm and diameter of 500 mm were constructed and tested up to failure. This paper reports experimental data about the shear strength of circular concrete beams reinforced with carbon-FRP (CFRP) bars and spirals. Although there is no evidence that these provisions do not apply equally well to nonrectangular sections, the behavior of circular sections has yet to be confirmed with experimental results. Considerable research in recent years has exclusively considered concrete members with rectangular cross sections in developing fiber-reinforced polymer (FRP) shear design provisions.
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