Effects of Stress-strain Relationships of Steel Materials upon Strain-Rate at Beam Ends

Abstract

Effects of stress-strain relationships of the steel material upon the strain rate of steel beams are discussed analytically. The parameter of the analysis is stress-strain relationships of steel materials. The results of this study are summarized as follows; 1)The stress-strain relationships have very large influence upon the strain-rate of the beams. If the material has the stress-strain relationships with plastic flow, the strain-rate of the member is extreme large. But in case of the relationship of round-house type, the strain-rate is very low. 2)During an severe earthquake, the strain-rate of beams changes. At the first cycle yielding, the strain-rate is very large. But after that the strain-rate becomes low and the influence of strain-rate becomes little.