OPENING PART SHEARING REINFORCEMENT METHOD FOR CONCRETE BOARD WHICH RECEIVES ANTIPLANE SHEARING FORCE AND ANTIPLANE BENDING

摘要

PROBLEM TO BE SOLVED: To provide a shearing reinforcement method for an opening part formed in the flat slab of a concrete flat slab structure against antiplane shearing force and antiplane bending or a shearing reinforcement method for an opening part formed in a concrete wall board receiving the antiplane shearing force and the antiplane bending. SOLUTION: Shearing reinforcements having a height h at which the reinforcement touch the upper end reinforcements and the lower end reinforcements of a flat slab and formed by wrapping spiral reinforcements or hoop reinforcements around a plurality of parallel vertical reinforcements are installed between the upper end reinforcements and the lower end reinforcements of the flat slab at positions near the opening edge of the opening part formed in the concrete flat slab receiving the antiplane shearing force and the antiplane bending along the opening edge in such an arrangement that is roughly parallel with a direction in which at least an outer force formed mainly of the antiplane shearing force and the antiplane bending act. Also, the shearing reinforcements are formed in such lengths (L1+L2+L2) as can sufficiently withstand the antiplane shearing force and the antiplane bending and disposed desirably in such a manner that crosses a shear fracture plane estimated in the flat slab. COPYRIGHT: (C)2005,JPO&NCIPI