Abstract
It is concerned that a long-duration earthquake in the future generates fatigue fractures in the steel structural components. The authors have investigated the member fracture of axial members including cold-formed circular hollow sections. According to previous study of steel braced frames, it’s suggested that more ductile structural components should be applied to a steel structure achieving higher seismic performance. On the other hand, it is needed to develop an aseismic design method of a steel braced frame taking member fracture into account of frequent middle or large earthquakes. In this paper, the interaction of cumulative deformation capacity between a circular hollow section brace with different diameter thickness ratio and a steel frame is investigated for extending basic knowledge of ultimate seismic resistance of steel braced frame, using finite element analysis, experiments including shaking table testing and evaluation of ductility factor.
