Abstract
Many concrete construction joint interfaces are expected to transfer shear forces In this study, three types of joint were examined for shear strength; concrete placed onto previously hardened concrete with an intentionally toughened surface (to 5-10mm); concrete placed onto smooth concrete or steel plate; and concrete placed onto steel formwork offering concrete shear key joints. The results of push-off shear tests form the basis for a discussion of the shear transfer mechanism, and a method of calculating shear transfer capacity is introduced based on limit analysis of lines of discontinuity for displacement. A design shear transfer strength equation, incorporating a certain safety factor, is then proposed and its propriety demonstrated.
