Study on Cost Effectiveness by Damping Reinforcement Using Risk Assessment Method of Existing High-Rise Building

Abstract

In recent years, high-rise buildings are required to possess the higher performance for earthquake disaster, not only for the conventional input ground motions of L1 and L2, but also for the L3 earthquake motions (maximum considered earthquake). Also, important facilities such as high-rise building is adopting the idea of the resilience based design in U.S.A., which comprehensively evaluates the higher seismic performance of buildings not only safety but also economical and recoverability. We set criteria targeting L1 to L3 earthquake for existing high-rise building, and made a comparison by earthquake response analysis between non-damping and damping reinforcement models. First, we probabilistically evaluated reduction of earthquake response value by damping reinforcement, and considered the cost effectiveness. As a result, expected damage cost greatly decreased, and there was merit in total price including cost of damping. Next, we made an evaluation using the life cycle cost considering earthquake occurrence probability, but results were different depending on earthquake probability evaluation model (engineering model by L1 to L3 earthquake, or the seismic hazard model from the earthquake ground motion prediction map). From now on, it is thought that probability evaluation model based on consensus with the societies of science and engineering will be important for promotion of higher seismic performance, such as the resilience-based design.