When the steel bars are embedded in concrete, the concrete after setting, adheres to the surface of the bars and resist any force that tends to pull or push this rod. The intensity of the adhesive force is called bond stress . It is the longitudinal shear stress acting on the surface between the steel and the concrete. The term bond is used to describe the means by which slip between the steel and concrete is prevented. The bond is provided by anchoring the bars properly and extending the bars beyond the point of maximum shear. OR Bond stress is defined as the shear force per unit of Nominal surface area of a reinforcement bar acting parallel to the bar on the interface between the bars and surrounding concrete. The bond between steel and concrete is mainly due to pure adhesive resistance, frictional resistance and mechanical resistance. The bond stress developed in concrete around the steel reinforcement is given by Design bond stress For deformed bars these values s
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