BOND-SLIP-STRAIN RELATIONSHIP OF DEFORMED BARS EMBEDDED IN MASSIVE CONCRETE

Bond tests of deformed bar embedded in massive concrete which have no effect of splitting crack were carried out. Bond-slip relationships obtained from extremely short embedment test are different from those obtained from long embedment test. Relationships between bond stress and slip depend on the location along a bar in short embedded pull-out test and in short embedded axial tension test. Bond-slip relationship of aluminium bar is different from that of steel bar. These results can be obtained by the analysis of using an unique bond-slip-strain relationship. The bond-slip-strain relationship model is formulated. This model includes the effect of bar diameter and concrete strength. In the case of condition that the strain is zero where slip is zero, the bond stress can be expressed only by the slip. The bond-slip relationship is formulated in simple form.