抄録
This paper presents the general solution of the local buckling strength, in the plastic range that implies F. Bleich's orthotropic behavior of material, which based on M. Kuranishi's elastic exact solution for a lipped channel and a rectangular-tube section members consist of thin-walled plate assemblies. We treat as the anisotropic behavior of the plates also when the applied load exceeds the critical load and we introduce the following approximated equation of equivalent width for the sections by using K. Marguerre's method when the stress along the longtudinal edges aproaches the yield point : b_e/b=б_<yi>(1+λ_e^4)+2σ_c/σ_<yi>(3+λ_e^4) where σ_<yi>=the yield stress, σ_c=the critical stress, and λ_e=the aspect ratio a/b at the elastic buckling. The results of coupon tests on fifteen different types of the lipped channel and the rectangular-tube sections as a short column under compressive load, are compared and checked with the values of the equivalent width of this theorie's result.
