抄録
There is a possibility to maintain plastic deformation capacity by synergism of web and flange of high strength steel beams even though its depth-thickness ratio larger than existing standard. In order to apply the above knowledge to practical design work, structural rank is to be determined by revaluing collapse mode and plastic deformation capacity of steel beams with large depth-thickness ratio. Also desirable treatments of practical application of steel beams with large depth-thickness ratio, concrete design methods, its procedures and possible advantages of steel beams with large depth-thickness ratio are clearly mentioned in this paper.
