The interface characteristics between concrete and steel plate with initial bonding is investigated under a pre-applied clamping stress. Under the stroke control mode, the complete tangential traction-slip curve of the interface is obtained. The influence of clamping stress on the behavior of the complete traction-slip curve is analyzed. The initial bonding of the interface will significantly increase the maximum tangential traction as compared to that without initial bonding. Based on the experimental results, parameters for a damage model are derived. With these parameters, the analytical traction-slip curves predicted by the damage model are compared with the experimental ones. Good agreement is observed between the two. The experimental results and the proposed damage model for concrete-steel plate interface provide a foundamental understanding of the traction-slip property of the interface which exists in a variety of composite constructions.

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