Abstract
It is known that a base-isolated building exhibits a large response to a long-duration, long-period wave. Additional dampers installed into main frame and isolation story of a base-isolated building may improve seismic performance of the building. In this paper, a design region in stiffness of isolator k_I- damping coefficient of isolation story c_I space is defined such that conditions on seismic interstory drift of isolation story, seismic acceleration of top story of building, and damping factor of isolation story are satisfied, and the region is called as "SC design region." The objectives of this paper are to propose a method of finding SC design region for base-isolated building with additional dampers and disclose basic characteristics of SC design region via total amount and distribution of damping coefficients of additional dampers in main frame.
