Synopsis The state of stress in the concrete due to bond forces from deformed reinforcing bars is analysed. For determination of the cracking resistance of the concrete cover, a concrete ring model is used. The stresses are calculated for an elastic stage, a plastic stage, and an elastic stage with internal ring cracks. The appearance of the concrete cover cracks along the deformed bars in the bond zones for normal cover thickness can be determined by using the mean of the values obtained for the two last stages. The partly cracked elastic stage gives cracking loads just on the safe side.

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Synopsis The state of stress along a lapped splice in reinforced concrete can be determined by using the modulus of displacement theory. The theory is based on actual displacement or local deformations in the bond zone near the surface of the reinforcement. The stresses along the anchorage length can also be estimated with moment cracks taken into account. Special attention must be paid to cracks in the cover along the reinforcement. In practice, however, the simpler equations with the concrete acting just as an adhesive between the lapped bars gives reasonable results. By using this theory, formulae can also be evaluated for other types of bond anchorage.

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