Basic experimental studies on the local buckling strength of carbon steel thin-walled square pipes subjected to an eccentric axial compressive load. In the case of different eccentricty at the upper and lower ends.

Abstract

This paper is concerned with a compression experiment in the case of different eccentricities at upper and lower ends on carbon steel thin-walled square pipes with various a/c rstios in the skort column range, supported with sphevical seats. An expirical formula for calculating eccentric compressive buckling stress σceo of the carbon steel thin-walled square pipes is presented as follows : σceo/σcr=1/{1+2.8(eo/c)}, eo=√((e12-e22)/2) where σcr=axial compressive buckling stress, e1=upper eccentricity e2=lower eccentricity, c=mean distance between walls, a=length. The measurement reveals that the results calculated by this equation are in good agreement with those obtained experimentally for the short column range.