Shear behavior and strength prediction of HFRP reinforced concrete beams without stirrups

Abstract

This paper investigated the shear behavior of carbon/glass hybrid fiber reinforced polymer (HFRP) bars reinforced concrete beams without stirrups. Seven beams with different span-to-depth ratios were tested under four-point loading. Results showed that the span-to-depth ratio had a significant effect on the shear behavior of the beams. According to the test data in this study and published relevant literature, a database containing 468 specimens was established to conduct an in-depth study of the factors that affect the shear capacity of FRP reinforced concrete members without stirrups. By comparing the predicted shear capacity of specimens according to the existing specifications and models with the experimental results in the database, it was found that the predicted results were relatively discrete. The factors influencing shear capacity considered by the specifications and proposed models are inconsistent, and the influence of the span-to-depth ratio was not taken into account. On this basis, a more comprehensive calculation method that considers the influence of span-to-depth ratio was proposed to predict the shear capacity of FRP reinforced concrete beams and presented better prediction results within the experimental.