Reinforcement design of existing non-conformed steel buildings using STKR columns (Reinforcement with steel plates and steel angles)

Abstract

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, in order to enhance the full-plastic moment of column, reinforcement with steel plates and steel angles are proposed. An experimental verification of reinforced columns was conducted to investigate elasto-plastic behavior and confirm the validity of reinforcement design method. As a result, specifications for providing required bending moment to STKR columns were clarified.