ELASTO-PLASTIC SEISMIC RESPONSE ANALYSIS OF HIGH-RISE BUILDING IN CONSIDERATION OF FLUCTUATION OF AXIAL FORCE ON CFT COLUMNS (PART 1): ANALYTICAL METHOD AND EXPERIMENTAL SIMULATION ANALYSIS OF SQUARE CFT COLUMNS

This paper presents elasto-plastic seismic response analytical method of high-rise building in consideration of fluctuation of axial force on concrete-filled steel tubular (CFT) columns and its application to structural tests of square CFT columns. In this analytical method, two strength curves named crack curve and yield curve are set on the stress plane of bending moment and axial force to judge the elasto-plastic behavior of the column ends. From the results of the experimental simulation analyses, the adequacy of this analytical method is verified.