Abstract
In order to grasp the present circumstances and problems of computer utilized structural calculation, we applied four kinds of simple building models we call 'benchmark structures' to various structural design programs actually used in various companies. We point out the following from our studies and investigations ; 1) We confimed conspicuous difference among the calculated results of stress analysis and the 'check and design' results of member section. 2) Calculated results of aseismic characteristics; modulus of eccentricity, story stiffness ratio and story deformation angle were also found very different, because of various interpretations of their definitions.