Experimental study on shearing performances of adhesive interface of double-superimposed specimens

Abstract:

The superimposed shear wall is a new assembly-type RC structure, now the superimposed shear walls are applied to medium and low-rise buildings in China. The shearing performances of adhesive interface is crucial in developing a monolithic action for superimposed shear wall; Different types of connecting reinforcement at the interface also influence the shearing performances, there has been no experimental study on the mechanical behavior of adhesive interface. The shearing performances of adhesive interface under different types of connecting reinforcement were analyzed through six double-superimposed specimens. The results showed that shear failure of the interface was the cause of failure of double-superimposed specimens, but the crack formation and development in the two interface was not in synch, the double-superimposed specimen kept good integrity until cracks began to appear. The failure of non-reinforced specimens was brittle, during the process of failure, the improved specimens in which the type of connecting reinforcement is stirrup taken on better ductility than the traditional ones in which the type of connecting reinforcement is truss bar; The ultimate shear strength of the interface was determined by adhesion of interface, shear-friction and dowel action of shear reinforcement, however, adhesion of interface had been destroyed in a certain extent under the limit state, the ultimate bearing capacity of double-superimposed specimens was not simply by summarizations of maximum of three parts.