鋼管トラス柱の曲げねじれ座屈に対する設計法

概要

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The conventional method of design (Design Standard for Steel Structures by Architectural Institute of Japan) evaluates the buckling strength of a compression chord by assuming that the effective length is equal to the distance between laterally stiffened supports for lateral-torsional buckling of a truss. However, web members and a tension chord fairly restrict the out-of-plane translation of the compression chord of a tubular truss, because tubular chords have high torsional rigidity. Accordingly, the effective length of a compression chord becomes short rather than the length by conventional method. On the other hand, if chord tubes have large diameter-to-thickness ratios or width-to-thickness ratios, web members cause local elastic deformations in the chord tubes and the nodal points are not rigid joints, which reduce the buckling strength. This paper proposes a method of design for lateral-torsional buckling of tubular trusses of which nodal points are unacceptable to be rigid joints.
一般社団法人日本建築学会の論文
1988-03-07