2013 Volume 20 Issue 79 Pages 79_123-79_133
In 2007, the building standard law of Japan was revised and a specification of column overdesign factor (COF) was added in case of square tube columns. Our researches deal with existing non-conformed steel buildings using STKR columns according to being not satisfied with the specification of COF. In this paper, reinforcement with steel plates, which is welded to column face and fastened by PC bars through floor slab, is proposed. An experimental verification of reinforced columns was conducted to confirm the validity of reinforcement design method. As a result, specifications for providing required bending strength and sufficient plastic deformation capacity to STKR columns were clarified.