Abstract
This paper is experimental study on the deforming and failing behaviors of reinforced concrete members with and without bond between reinforcing bar and concrete. 7 pairs of specimens : 7 members with bond reinforcing by deformed bars and 7 members without bond made by covering the deformed bars with paraffin wax, were tested. The maximum bond stress between deformed bar covered with paraffin wax and concrete is about 0.1% of that between deformed bar and concrete. The loading conditions are reversed cyclic bending moment, one way monotonic bending moment and axial force, reversed cyclic bending moment and axial force, one way monotonic bending moment and shearing force (a/d=2 and 3), and reversed cyclic bending moment and shearing force (a/d=2 and 3). Deforming and failing mechanism, and hysteretic characteristics of the specimen without bond are different from those of the specimen with bond. Some discussions about the differences are done. It is found that merits and demerits of the existence of bond depend on the capability demanded to the member.
