Method for designing through hole of steel frame and steel frame including through hole

摘要

PROBLEM TO BE SOLVED: To provide a technique which maintain strength of a steel bar, and make a through hole aperture of a web of a steel-frame smaller than before.SOLUTION: A design method of a steel-frame through hole in a web of a steel-frame of a steel-framed reinforced concrete structure comprises: an original design processing in which a through hole aperture of the steel-frame is obtained based on outer diameters of two steel bars that are lapped and inserted into the through hole of the steel-frame, and the cross sectional areas of the steel bars are obtained; and a correction processing in which at least one of the steel bars inserted into the through hole of the steel-frame is bundled as a bundled bar bundling a plurality of steel bars, and the through hole aperture is designed so that the sum of the cross-sectional areas of the bundled bar is not less than the cross sectional area obtained in the original design processing, and so that the through hole aperture of the steel-frame is smaller than the aperture obtained by the original design processing.SELECTED DRAWING: Figure 3