STRUCTURAL CHRACTERISTICS OF EXISTING SMALL SIZEMIDDLE RISE STEEL BUILDING STRUCTURES IN JAPAN

摘要

In Japan most popular structure for middle rise buildings is steel structure. In this paper structuralinvestigation results about 92 existing small size middle rise steel building structures are described. Thoseare structural figures, main structural members, static and dynamic characteristics of the structures.Structural figures are size of each floor, framing arrangement, number of stories and so on. Size andthickness of steel member of main columns and beams are presented. As static characteristics ofstructures, shear coefficient of each story, natural period, ultimate lateral strength of each story,distribution of rigidity of each story, strength ratio of column to beam at each beam-to-column connection,are investigated. In order to get dynamic characteristics, elastio-plastic dynamic response analysis using 5kinds of severe ground motions were executed about each structure. From those analysis response valuesabout inter-story drift angle, factors of accumulated plastic deformation of each structural member areobtained. Through this investigation actual structural characteristics are clarified and it becomes clear thatmost of existing small size middle rise steel building structures in Japan which were built after therevision of building code in 1981 have sufficient earthquake resistant ability against sever earthquakes.