Abstract
This study proposes an optimal selection method for base-isolation devices in a mid-story isolation structure using a genetic algorithm. Parameters employed in the genetic algorithm's evaluation functions are: A) eccentricity ratio, B) vertical load on each isolator, C) temporary load on each isolator, D) natural period, E) yield force coefficient of base isolation devices, F) the maximum response displacement of isolation devices, G) storey shear force coefficient and H) base isolation displacement. We employed three groups of parameters: (1). A-B-C-D-E, (2). A-B-C-E-F, (3). A-B-C-G-H. We did time history response analyses with buildings designed by the proposed method. As the result, the response value was suppressed in case of (3). Therefore, the proposed method is effective for selection isolation devices for mid-story isolation buildings.
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