耐震架構全体分散型と外周集約型の鋼構造事務所建物の構造性状比較

Abstract

Structural characteristics of standard steel office buildings are investigated. Buildings are designed in two types of lateral resisting systems, which are space frame system (SFS) and perimeter frame system (PFS). Moment resisting connections are used in most of beam-column connections in SFS, where the columns are typically square hollow structural sections subject to bi-axial bending moment under lateral forces. Contrarily, the moment resisting connections are limitedly used in the perimeter frames in PFS, where the columns are I-shaped sections and simple connections are used for beams connecting perpendicular to the lateral frames. Steel quantity is minimized under allowable stress design constraints. The design variables are the section sizes. It is found that the total steel quantity and welding length of PFS are smaller than those of SFS in four, seven and ten-story standard office buildings.