Relationship of Bond Stress, Steel Stress, and Slip in Reinforced Concrete

Abstract

This paper presents an experimental analysis to establish the fundamental relationship between bond stress, steel stress, and slip in reinforced-concrete structures. Tests were conducted on double pullout specimens reinforced with 25-mm plain round mild steel, cold-worked and hot-rolled ribbed bars that had been fully instrumented internally with electrical resistance strain gauges. The results provided examples of the longitudinal variation of the steel strain (analogous to that between cracks). The method has proved to be capable of providing sufficient data for plotting the distribution of steel stress, bond stress, and slip between flexural cracks. The relationship between bond stress, steel stress, and slip was derived from the steel strain function, and has been represented by empirical formulas.