組立圧縮材の座屈に関する実験的研究

Abstract

An experimental study is made of the buckling strength and behavior of steel latticedcolumns under central thrust. Two angles or channels constitute a column specimen with a fewconnections across them. A total of twelve specimens are tested, using sections of L-65 x 65 x 6and [ 100 x 50 x 5 x 7.5. Test results are compared in the elastic range with an approximatetheory which regards a latticed column as a portal frame with rigid beams and contractivecolumns, to have a general consensus. It is observed both from the theory and tests that theexistence of a single connection at the mid-height increases the buckling strength for a columnof angles, but not appreciably for a column of channels; the difference is due to the torsional de-formation possible in the angle column, which breaks down the symmetry of the buckling mode.