Abstract
In recent years, high-rise buildings are required to possess the higher performance for earthquakes, not only for the conventional input ground motions of L1 and L2, but also for the L3 earthquake motions (maximum considered earthquake ground motions), which are the ones with a probability of once every several thousand years, such as the long-period ground motions with long-duration from a M9-class subduction-zone earthquake, and/or the near-source ground motions from large-scale active faults. As for the existing high-rise building, there have been many retrofitting cases using additional dampers, by considering only the long-period ground motions, but the near-source ground motions. Therefore, in this study, we evaluated earthquake resistance performance using additional dampers against various types and levels of input ground motions, not only for long-period ground motions, but also for the near-source ground motions. As a case study, we chose Kogakuin University Campus of the steel moment-resistance frame building with 28-stories. As for the method of arranging dampers, we used a relatively simple method of pushover analyses using a 3D structural model, and decided the arrangement of dampers based on the deformations of the stories and the dampers. As a result, we obtained an effective damper arrangement model of 44 dampers, and confirmed the validity of the model by conducting seismic response analyses using the various input ground motions.
