Study on Seismic Retrofit Planning Method for Seweage Treatment Plants on the Basis of Seismic Risk Management

Japanese sewerage has more than 100 years of history, and many facilities have passed their durable years. For the sake of economy, life lengthening of the equipment and facilities is required. Rational life extension of the equipment and facilities calls for aseismic reinforcement of structures with damage risks considered. Based on this, the author et al. suggested a method that will help planning rational aseismic reinforcement for sewage treatment plants. This method quantitatively evaluates the relationship between the earthquake risk and aseismic reinforcement cost by introducing the concept of risk management. In this study, availability of this method also has been verified with exemplification.