Yoshimichi Kawai

Damage-Control Systems Using Replaceable Energy-Dissipating Steel Fuses for Cold-Formed Steel Structures: Seismic Behavior by Shake Table Tests

AbstractA system that controls the rocking behavior of multistory shear walls is proposed as an innovative damage-control system for cold-formed steel structures. In this system, we have developed a new hold-down equipped with a fuse function (HDF) that controls the rocking behavior and is placed on the foundation of multistory shear walls. The HDF contributes to reducing damage to both structural and nonstructural members in cold-formed steel framed buildings, dissipating seismic input energy in the event of a large earthquake. The present paper describes the shake table tests performed using one-story, one-span, real-size specimens to investigate the fundamental behavior of the developed system. By using shake table tests in which the type of hold-down and the magnitude of input ground motion were varied as parameters, it was clarified that the plasticization of HDFs could reduce the base shear of specimens and that the energy dissipation by the HDFs could subdue the uplift deformation of the specimens....

Shear Resistance Mechanisms on Steel Sheet Shear Walls with Burring Holes and the Effect of Cross-Rails

Steel sheet shear walls are panels in which sheets with burring holes aligned along the vertical direction are fastened to frame members and are applied to multi-story buildings in seismic regions. The wall that receives the in-plane shear force allows shear stress to concentrate in intervals between the burring holes. Finite element analyses and in-plane shear experiments revealed that all intervals between the holes were simultaneously deformed, and buckling areas were limited in the intervals by ring-shaped ribs of the burring holes. The effects of cross-rails are minimal in elastic region. Post-buckling behavior depends on tension fields on the intervals and restraints by cross-rails. The allowable design strength formulas and the indices of strength after buckling are developed.