鋼構造建築物の柱材として箱形断面部材や角形鋼管部材といった正方形中空断面部材が使用されており，柱材には自然外力によって二軸曲げせん断力と軸力が作用する。その弾塑性挙動は破断を除けば局部座屈(Photo Ⅰ)によって決定されるため，建築物全体の耐震性能を正しく評価するためには二軸曲げせん断力と軸力を受ける正方形中空断面部材の局部座屈を伴う大変形挙動を解明する必要がある。%The purpose of this study is to present approximate formulas for elastic local buckling strength of square hollow section members under biaxial bending shear force and axial force. For this purpose, buckling analysis considering coupled effects of plate elements and complex stress conditions by bending, shear, and compression is conducted using energy method. Effects of determinants of the buckling strength, boundary conditions, aspect ratio, and stress conditions of the plate elements are understood. Simple approximate formulas for the coupled local buckling strength corresponding to boundary conditions at both ends, shape and stress distribution with respect to the members are presented.
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