Abstract
This paper presents an analytical approach to the optimality of ploy-linear type hysteretic damper useful for near-field ground motions such as the Hyogo-ken Nanbu(1995) earthquake on the basis of seismic random earthquake response analysis. Numerical calculations are carried out for six-degree-of-freedom structural systems with the damper. From two viewpoints of preservation of structural seismic safety and improvement of structural amenity, the optimum parameters of the damper are determined in such a way that the structural systems suffer no damage under medium or strong earthquake excitations, while the systems suffer only minor recoverable damage under severe or catastrophic earthquake excitations. The applicability of the optimum poly-linear type hysteretic damper based on the stationary non-white random process is demonstrated through the simulation analysis using the recorded earthquake accelerogram during the Hyogo-ken Nanbu earthquake.
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