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The authors have been researching and developing methods of retrofitting existing reinforced concrete buildings with friction dampers. This paper presents an application of the response control retrofit method to reinforced concrete(R/C) buildings. In this seismic retrofit method developed for R/C buildings without sufficient ductility, the seismic capacity of an existing building is enhanced by installing steel damping braces on the external walls of the building to absorb seismic energy efficiently within small amplitudes of deformation. A friction damper is embedded in each barce along itse axis. In the conventional retrofit methods, sashes and interior nonstructural members have to be removed before installing strenghtening members, leading to the interruption of the usage of buildings the retrofitting work. This shortcoming is overcome by the present method because braces are installed only on the external walls of the building. Thus, the building can be used during the retrofitting work and the manhours are reduced significantly as well as the cost and the period of the work. This method is considered environmentally friendly because of the less amount of waste generated by interior demolition and less noise. This damping retrofit method has been applied to several cases of the actual buildings so far, including school buildings, apartment buildings, and hospital, etc.

C10 Application to Response Control Retrofit Method by Means of External Damping Braces Using Friction Dampers