Study of optimum vibration control design for joint structure system.

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Optimization technique for the purpose of aseismec desiqn of complex multiply supported structures such as boiler-structure or piping-building is proposed. Particular attention is focussed on the calculation of optimum damping characteristics of the structures and those components.Under the requirement of certain limited amount of response, optimum stiffness and damping value can be semi-automatically calculated through this method. Pseudo least square algorithm is introduced to determine the optimum design parameters. In order to demonstrate the applicability, optimization of the combined boilerplant structures connected by the inelastic "seismic ties" was realized.Secondly, adjacently desiqned structures connected by semiactive controlled damping devices are taken into consideration. Optimum characteristics of the damper can be determined by this procedure.This method is applied to a fundamental multi-dagree of lumpedmass model of connected boiler and its supporting structure.As an objective function, a total of the story shear force of the supporting structure was selected. As the result of this work, the proposed optimization has been proved to be effective and practical for the aseismic design of the adjacent structures having damping devices at the connecting joints.