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This paper presents seismic retrofitting technique of existing SRC buildings with newly added stories. A number of the stories are reduced from the top of the building. A lightweight super structure of steel moment resisting frames is newly built on the rooftop through a mid-isolation system with lead rubber bearings. Design formulae of the optimum strength and stiffness are presented through computed response surface method in terms of the maximum drift angle of the existing part. A performance curve diagram is formulated. Finally, examples of the retrofit are shown for buildings having seven or ten stories.

SEISMIC RETROFITTING TECHNIQUE OF EXISTING MID-RISE SRC BUILDINGS WITH NEWLY-ADDED STORIES UTILIZING MASS DAMPER EFFECT