長繊維棒材を補強筋とするコンクリート梁のせん断補強効果

概要

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Recently, there have been made studies for reinforcing concrete members with fiber reinforced plastics rods, called FRP rods, which are light in weight, high in strength, and excellent in corrosion resistance and magnetization proof. This study describes the effects of shear reinforcement in concrete beams reinforced with FRP rods, obtained from the shear test on beam models under monotonic loading. The test variables were the type and the shear reinforcement ratio of FRP rods and beam span. The following observations have been found : the shear capacity decreased linearly with increasing the span ; it increased linearly with increasing the reinforcement ratio ; it increased linearly with increasing the product of the reinforcement ratio and the square root of elastic modulus of FRP rods ; and at the ultimate state the portion of capacity carried by concrete was very small, which was obtained by subtracting the sum of stress of the FRP stirrups across a critical shear crack from the total capacity. Moreover, in the case when the shear capacity was determined by the rupture of FRP stirrups, the average stress of the preceding FRP stirrups was almost constant in the same type, which was independent of the reinforcement ratio. From the above observations, a tentative formula has been derived for estimating the shear capacity of concrete beam reinforced with FRP rods, which was based on the arch-truss mechanism.
東海大学の論文