Study on Shear Behavior of Bonding Interface between Ribbed Steel and Concrete
To investigate the shear behavior of the steel-concrete bonding interface for prestressed concrete beam with reinforcing ribbed steel plate,push-out tests and finite element analysis of the bonding interface were conducted in this paper.The shear force-displacement curve,shear strength and failure modes of the bonding interface were measured by the push-out test.Comparing the shear strength of specimens with and without stiffeners,the influence of stiffeners on the shear strength of the bonding interface was obtained.Through parametric analysis,the major design parameters that affect the shear performance of the bonding interface were obtained.The research results show that the shear strength of the steel-concrete bonding interface with A-level adhesive is about 2 MPa,the ultimate slip deformation is about 0.2 mm,and it is governed by the shear bond failure between the adhesive layer and the steel plate.Increasing the bond strength from 2 MPa to 4 MPa enhances the shear strength of the bonding interface by about 38%.Increasing the bond strength is expected to improve the shear performance of the bonding interface.Stiffeners increase the local shear stress of the bonding interface and decrease the shear strength of the bonding interface.The weakening effect of stiffeners on the shear strength of the bonding interface might be included in the strengthening design.
bridge strengthenshear strengthpush-out teststeel-concrete bondfinite element analysis
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