A Study on the Stability of Circular Section Steel Stub-columns i n the Plastic-flow Range ‹D i screpancy Between Theory and Experimental Result for Elephant-foot Buckling›

Abstract

Maximum stress obtained by compression test of circular steel stub-columns were compared with deformation theory and incremental stress-strain theory. Each buckling analysis has a term of tangent modules Et in its solution. Therefore these solutions mean that all specimens buckle in the plastic-flow range before strain-hardening regionregardless of its diameter-to-thickness ratio. In spite of these theories, it is shown that specimens with small diameter-to-thickness ratio can be compressed into the strain-hardening range. Furthermore the efficiency of endurance of compressive force is referred between box-section and circular section steel stub-columns.