Abstract
The objective of this study is to examine the strength formulas of square steel tubular beam-columns on the basis of the strength formulas specified by the “Recommendation for Limit State Design of Steel Structures”. The strengths of square steel tubular beam-columns are obtained by the analytical work, where the axial load ratio, slenderness ratio and moment gradient ratio are selected as a numeric parameter. The stress-strain relation is assumed to be elastic-perfectly plastic. Relations between analytical maximum strengths and the strengths calculated by using the AIJ LSD guide are presented and the validity of the strength formulas is investigated.
