Experimental study on shear behavior of BFRP-reinforced recycled aggregate concrete deep beams without stirrups

This paper describes an experimental investigation to evaluate the shear performance of basalt Fiber-reinforced Polymer (BFRP)reinforced recycled aggregate concrete deep beams without stirrups. A total of 13 beams were tested under four-point loading until failure: nine were reinforced with BFRP bars, and four were reinforced with steel bars. The parameters of this experiment included the shear-span-to-depth ratio (a/d), reinforcement ratio of the longitudinal bar (rho), sectional effective depth (d) and compressive strength of the recycled concrete (f(c)'). The shear behavior of the beams was described in terms of the crack type, failure mode, shear strength and load-deformation relationship. The effects of the experimental variables on shear capacities and deflections of the tested beams were also investigated. The experimental results showed that the shear capacity of BFRP-reinforced beams was smaller than that of steel-reinforced beams. Additionally, the deformation of BFRP-reinforced beams was larger than that of steel-reinforced ones. The shear capacity of BFRP-reinforced recycled concrete beams without stirrups showed a linear relationship with the sectional effective depth d and was proportional to (d/a)(4/3), (rho)(1/5) and (f(c)')(1/3). Meanwhile, four existing codes were used to predict the shear strength of test beams and the CSA806-02 gave the better results.