COLUMN-TO-BEAM JOINT STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide a column-to-beam joint structure for preventing concentration of plastic deformations by making the diameter of a bolt hole at the farthest position from a column or at the nearest position to the column smaller than the diameters of other bolt holes for an increase in section modulus at that position, and for shortening the length by which a bracket protrudes from the column, by shifting the position of the reduced-diameter bolt hole toward the column. SOLUTION: The column-to-beam joint structure comprises a steel-pipe column 1; a diaphragm 2 having a bracket 3 of H-shaped cross section and installed at the column 1; and a beam 5 bolted to the bracket 3 via a scab 7. The width of the flange 3F of the bracket 3 is formed to be greater than the width of the flange of the beam 5 and to increase toward the column 1. Of the bolt holes bored in the flange 5F of the beam 5 for bolts for jointing the scab 7, the bolt hole at the farthest position from the column 1 is made smaller in diameter than the other bolt holes.