N}Et wr deicaes eMv}k7"u-x sr">2g a) ca ft Amadeo B[lIVA ;,ZE)IVT CLIMEIVT*' and Hiroshi AKIYArm' '} 77 7"t, igkza the resistance ofa structure against an earthquake is related to its ability to absorb the seismic input energy. in the prevailing desigri practice the energy is absorbed by plastic defoTmations on building fratne-components such as beams and columms. Hewever, the experience in past earthquakes has shewn that evaluating and repairing the plastic deforrnation and the associated

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... e on the frame is often dithcult and expensive. Thus, the development of altemative devices for dissipating the seismically induced energy on the stmcture is highly desirable, in this paper a new type of hysteretic damper, which can be insta11ed in a building frame as a concentric brace, is suggested. The darnper takes advantage ofthe high energy absorption capacity ofthe round-shape steel rods when subjected to flexural deformations. The design cliteria for the damper is described and its behavior is assessed experimentally. Keywords: Earthquake Resistant Design. Hysteretic Damper, Steel Rods, Brace DamperJ]nerev Absorption Capacity ntRitbl msyJ-i<-, suua ffv・-xytzi<-. =*,v\-wqyeeh consisting offriction brake linings introduced at the intersection of frame cross braces. Aguirre et al,5 suggested to mount U-shaped steel strips in a braee element. Also, the so-called "unbonded brace" consisting of a steel core plate confined by a steel cylinder fi11ed with concrete, has been developed and applied to actual buitdings6, The autliors have investigated a new type of hysteretic damper which can be installed in a building frame as a conventional concentric brace. The propesed damper takes advantage ofthe energy absorption capacity of the round-shape steel rods subjected to bending. The main features ofthe damper are/ a)high energy absorption capacity which can be easily predicted by a serni-empirical method7; b)easy adaptability te different requirements of strength and stiffhess; e)easy inspeotion and reparation after the eanhquake. This paper presents the design criteria for the damper and the methodology to predict its behavior. Finally, the prediction is verified experimentally. ' Prof.,