If reinforced concrete beam exists crack, ultimate shear transfer strength and shear hardness of section with crack substantially decrease. In this study , five model beams were designed for the objective of clarfying contributions of three shear resistant elements : the compression zone of concrete, dowel action of tension reinforcement, aggregate interlock across cracks, The shear force carried by each resistant element was calculated from the detailed strain data on the contributions to the shear capacity of beams of the shear forces carried by the other three resistant element. The test result follows : 1) Compression zone of concrete (C)-56.2%, 2) Dowel action of tension reinforcement (D)-18.0%, 3)Aggregate Interlock(A)-25.8%.
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