Abstract
Abstract: In this study, to examine seismic reinforcement effect of a school building constructed prior to application of seismic design, a Double I-type damper supported by wall was installed to perform comparative analysis on existing non-seismic designed RC frame. As a result o f experiment, while non-seismic designed specimen showed rapid reduction in strength and brittle shear destruction as damages were focused on top a nd bottom of left and right columns, reinforced specimen showed hysteretic characteristics of a large ellipse with great energy absorption abilit y, exhibiting perfectly behavior with increased strength and stiffness from damper reinforcement. In addition, as a result of comparing stiffness reduc tion between the two specimens, specimen reinforced by shear wall type damper was effective in preventing stiffness reduction. Energy dissipation ability of specimen reinforced by Double I-type damper was about 3.5 times as high as energy dissipation ability of non-reinforced specimen. Such e nhancement in energy dissipation ability is considered to be the result of improved strength and deformation.Keywords: Double I-type Hysteretic damper, Strength degradation, Stiffness degradation, Energy dissipation, retrofitted
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