BASE PLATE FOR COLUMN BASE

PROBLEM TO BE SOLVED: To provide a base plate for an exposed-type steel-frame column base, which prevents the occurrence of the stand-on-tiptoe phenomenon and shade bending phenomenon (plastic deformation) of the base plate when subjected to repeated bending moment, and which enables downsizing of base concrete by bringing an end of the base plate, serving as the side of compression, into surface contact with the base concrete. SOLUTION: This almost rectangular base plate 12, wherein at least respective corner parts fixedly attached to a lower end of a steel-frame column 11 are equipped with bolt holes, is composed of a steel product whose yield point is 400 N/mm2or more. The relationships, (B/2-d/2t)3≥20 and B/t≥14, are set to be established among its overall width B, a plate thickness t and a column diameter d of the steel-frame column, so that only the compressed side of the base plate 12 can be plastically deformed due to the repeated bending moment M. Thus, the base concrete 13 can be reduced in size by preventing the occurrence of the stand-on-tiptoe phenomenon etc. COPYRIGHT: (C)2005,JPO&NCIPI