抄録
This paper describes the torsion of the compressive H-section members in inelastic range theoretically and experimentally. Limit design method and elasto-plastic numerical analysis are adopted in this analysis. Especially in the latter theory, it is one of the purpose of this paper to point out the appropriateness of the judgement, whether the core of the section is elastic or not. Therefor the torsion test was carried out and compared with their theories. The section of spcimens is H-125×125×6.5×9. The both ends are restrained the warping. There are three kinds of the slenderness ratio about the strong axis, 20, 40 and 60. Also axial load ratio P/P_y has four kinds, 0, 0.2, 0.4 and 0.6. From these investigations, following conclusions are obttained. (1) Limit design method gives the good approximate estimation of the torsional yielding. (2) Elasto-plastic numerical analysis agrees with the experimental behaviour in the field of not only small deflection but also large deflection. (3) This elastic-plastic judgement, considered the torsional shair strain is effective on the analysis of the behaviour of the steel members beyoud the elastic range.
