The torispherical shell is a structure which is composed of a spherical,a toroidal and a cylindrical shell.When the internal pressure is loaded on a torispherical shell,hoop compression stress occurs around the junction between the spherical and toroidal shell, and this hoop compression stress can cause buckling. The purpose of this study is to establish a evaluation method for the internal pressure buckling of the torispherical shell using FEM(Finite Element Method) .For the evaluation of the

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... uckling pressure by the FEM,it is important to give appropriate initial imperfection setting to the analysis model.We investigated the effect of the magnitude and shape of the imperfections on the buckling pressure,and examined the method of evaluating the minimum buckling pressure.We estimated the minimum buckling pressure vs.the thickness relationship from the minimum buckling pressure at a certain thickness.This evaluation showed the same tendency of conventional studies. We estimated the permissible pressure of the actual thickness based on the proposed FEM.