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The local bond stress-slip relationships of deformed bars embedded in confined concrete under monotonic and cyclic loading for various bond conditions were investigated in an extensive experimental study. The results were used to deduce an analytical model of the bond behavior under random excitations. By evaluating experimental results of long anchorages, the model was extended to cover the bond conditions found in joints of R/C frames under severe seismic excitations. The model was successfully used to predict the behavior of deformed bars anchored at interior joints and subjected to various loading histories.
Eligehausen et al. (Fri,) studied this question.