The elastorplastic analysis of beams under dynamib loadings has been done by many investig-ators. However, since actual characteristics of the bending moment～curvature relation have not yet been clarified for arbitrarily varied cyclic loads, idealized hysteresis models such as the elastic～perfectly plastic or the bilinear ones have been used for practical analysis. Therefore, the obtained results may not necessarily give the accurate actual behaviors of beams. Previously, it was shown that the prediction of stress～strain relationship of annealed low carbon steel under arbitrarily varied uniaxial cyclic loadings is possible by means of producing the computer program based on the experimental results by the author and other. In this paper the dynamic elasto-plastic analysis of simply supported beam is presented by using above-mentioned actual stress～strain relationship to determine the moment～curvature relations. The differential equations of motion are solved by means of a single step forward integration procedure. Results obtained from two different conditions of loading are shown and compared with the responses of corresponding beam with bilinear characteristics.
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