The design of a base-isolated structure should satisfy various design conditions with respect to the base-isolated layer. Using existing methods, designing a structure with a complicated planar shape is extremely time-consuming. The purpose of the present study is to determine the optimal arrangement of base isolators using a genetic algorithm. The arrangement is evaluated with respect to: (1) the eccentric factor of the base-isolated laer, (2) the vertical load on each isolator, (3) the natural period of the base-isolated layer, (4) the damping factor of the base-isolated layer, and (5) the maximum response acceleration of the upper structure. The proposed method of analysis is applied to an actual designed structure to optimize the arrangement of the base isolators. Evaluation produced almost the same natural period, amping factor, and econtric factor as the example used. A structure with a base isolator arrangement determined using the proposed method of analysis. In addition, the peformance of the base isolator arrangement obtained using the eccentric factor, vertical load, and maximum response acceleration was found to be almost equal to that obtained using the natural period or damping factor insteady of the maximum response acceleration.
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