Recent studies predict that Nankai-Trough earthquake to be a huge one. As a mitigating measure, passive dampers are widely adopted to control structural vibrations of buildings. These devices work effectively against the inter-story shear deformation of the building frame. In contract, they are less effective when building deformation is mainly characterized as flexural or bending deformation. It is, therefore, important to study the effective damper deformation in order to evaluate vibration control performance. This paper aims to clarify the relationship between the effective damper deformation and damper ductility demand when the damper works effectively.
In this study, a hysteresis damper using bent steel plates for base-isolated structures (BSPD) is proposed. The BSPD comprise four steel plates bent into a trapezoid. The bent steel plates are connected together in the shape of a cross. The characteristics of the BSPD are as follows; (1) the BSPD follows the large deformation, (2) the mechanical behavior is changed depending on the shape of the bent steel plates. This study investigates the influence of the shape of the bent steel plates on mechanical behavior of the BSPD via shear loading test and finite element analysis.
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