Research On Shear Behavior Of BFRP-reinforced Recycled Aggregate Concrete Deep Beams Without Stirrups

In recent years, new materials and technology have been developed rapidly. While atpresent, the research mainly focus on the common reinforced recycled concrete member andordinary concrete member reinforced with FRP. Home and abroad, research about combiningthe two materials has not been reported. There are large differences between FRPreinforcement and reinforced in physical and mechanical performance, such as elasticmodulus, tensile strength, surface characteristics and bonding properties of reinforcedmaterial. And recycled aggregates itself has the features of micro cracks and large porosity, itson the physical and mechanical problems such as strength, stiffness exist difference withordinary concrete. There are many diffferences between the ordinary concrete memberreinforced with FRP, common reinforced recycled concrete member and recycled concretedeep beam reinforced with BFRP on the shear performance.Therefore, research on the shearperformance of concrete deep beam reinforced with BFRP is needed.In this paper,9BFRP-reinforced recycled aggregate concrete deep beams withoutstirrups and4reinforced recycled aggregate concrete deep beams without stirrups areresearched through the four point load test, shear test phenomenon, ultimate bearing capacity,failure pattern, etc are observated and acquisited for test beams. In this paper, the maincontent is as follows: specimen cracking load, ultimate load; the change rule of strain ofreinforcement and concrete and deflection in the mid-span of beams in the test process; thecrack development and the corresponding load in the test process; the analysis of failurepattern for beams.The existing calculation model can’t for the calculation of the shear bearing capacity ofconcrete deep beam reinforced with BFRP. Thus, the test data is analysed, theory calculationformula for shear bearing capacity of concrete deep beam reinforced with FRP is put. Thetheoretical results fit well with the experimental values. So the formula to calculate the shearbearing capacity of concrete deep beam reinforced with BFRP has a certain degree of safetyand accuracy.