Study of the shear fatigue of reinforced concrete beams

This investigation, involving the testing specimens - 6 specimens for the steel bar under reinforced concrete beam, each 4 specimens for the steel bar over reinforced concrete beam and the deformed steel bar under and over reinforced concrete beams - subjected to 2 concentrated loads in the stake of a/d≒1 is to research for fatigue limits of reinforced concrete beam subjected to shearing repeated load. Then, the authors described the variation of strain and deflection, and described that the judicatory standards by a/d of the failured boundary may be applied to reinforced concrete beams under repeated load as well as static load. Additionaly, they described that the calculated values by the theoretical equations of deflection, bending moment and shear force agree well in the values of experiment. Roughly speaking, the fatigue limits are thought that the steel bar under and over reinforced concrete beams are approximately 45 per cent, and the deformed steel bar under and over reinforced concrete beams are approximately 40 per cent for the failure loads of static tests.