J.B. MANDER, J.M. BRACCI and A.M. REINHORN State University of New York at Buffalo

This paper presents an evaluating and retrofitting design philosophy and a case study. A one third scale model of a three storey gravity designed reinforced concrete frame was constructed and tested on a shaking table under earthquake motions. Results showed that inter-storey drifts were unacceptably high. Four retrofitting methods were considered using masonry and requiring minimal disruption to the building and its occupants. For each method, comparative non-linear dynamic time history analyses were carried out using the program IDARC for various ground motions. Post earthquake damage is compared and conclusions drawn on the efficacy of each retrofit method.