隅角部の曲面が箱形断面部材の軸圧縮特性に及ぼす影響

抄録

In this paper, the influences of round corners on axial compressive properties of the box-section members, such as, nonlinear behavior, yield and ultimate strength, and energy absorption capacity are examined by the finite element method. In this method, so-called 9-node isoparametric degenerated shell element with independent displacement and rotation degrees of freedom is used. The Green Lagrange strain definition and the Prandtl-Rcuss stress-strain relation following the von-Mises yield criterion are applied to incorporate the geometrical and material nonlinearity. The box-section members without longitudinal stiffeners are adopted as analytical models, in the numerical examples. The influences of round corners of cross section on axial compressive properties are examined with different sizes of the round corner radius.