The purpose of this study is to examine the effects of a seismic retrofit and renovation on the sprinkler piping of existing buildings. In a full-scale experiment, it is difficult to model a sprinkler piping system deployed in a wide area. Therefore, we created a model of a sprinkler system installed in an evaluation building, and conducted numerical analysis. It was demonstrated through numerical analysis that the horizontal sprinkler piping was vulnerable. In contrast, the installation of braces on the horizontal sprinkler piping was demonstrated to contribute to improved aseismic performance.
