軸心圧縮荷重を受ける有孔角形短柱鋼管の局部座屈強度に関する実験的基礎研究

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This paper treats compression experiment of rectangular steel pipes. They are supported with spherical seats. The length pipes exists in a short column range. Each pipes has a circular hole on a side wall. The measurement reveals that breaking of the pipes occurred as the local buckling of the flat wall with a circular hole. It was found that the buckling stress decreased as the open ratio d/b increased and section ratio c/b decrased. In consideration of experimental result, an emperical formula for calculating axial compressive buckling stress σ_<crn> is presented as follow; σ_<crn>/σ_<cr>=1-a_0 (d/b)^<b0> a_0=0.69 (c/b)^<0.42> b_0=1.97 (c/b)^0.58 where σ_<cr>=axial compressive buckling stress of the pipes without a circular hole, a_0 and b_0=coefficient of section ratio c/b, c and b=mean distance between walls, d=diameter of circulsr hole.
東海大学の論文