BOND-SLIP RELATIONSHIP UNDER REPEATED LOADING

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Abstract
The effects of the loading histories on the local bond-slip relationship was investigated from the reinforced concrete specimens, in which the test bars were effectively contacted with concrete in a short length (four times the pitch of transverse rib). It could be pointed out throughout the test observation that a small number of repitition within a limited slip range did not give a significant effect on the bond-slip behavior at a larger slip in the subsequent cycles and, on the other hand, once the peak slip was increased, a considerable reduction in bond was produced at a lower slip in the subsequent loading history. From the test results, the basic bond-slip law under repeated loading was derived, which provided a satisfactory agreement with the experimental results. The basic bond-slip law was successfully applied to the prediction of the behavior of concentrically reinforced concrete prisms under repeated loading. It was also recognized that the degree of the concrete confinement surrounding the bar gave a significant influence on the shape of the envelope curve of bond-slip relationship.

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