Abstract
In AIJ (Architectural Institute of Japan) design formula for slender composite columns, modified method of the superposed strength of a column section is adopted by considering the effect of additional bending moment (Pδ moment) . In this paper, with respect to the ultimate strength of concrete filled steel tubular columns, end moment (cMu)-axial force(cNu) interaction relations are calculated by assuming a sine curve deflected shape of a concrete beam-column. The value of concrete compressive strength ranges from 240kg/cm2 to 960kg/cm2. On the basis of the analytical results, the interaction relations are proposed as an algebraic equation. Moreover, example for calculating the end moment-axial force relations is demonstrated.
