偏心軸圧縮荷重を受ける薄肉正方形鋼管の局部座屈強度に関する実験的基礎研究 : 上下端の偏心距離が異なる場合

抄録

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 "σ_ceo" of the carbon steel thin-walled square pipes is presented as follows : σ_ceo/σ_cr=1/{1+2.8(e_o/c)}, e_o=√((e₁²-e₂²)/2) where σ_cr=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.