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This paper discusses hysteretic tuned mass dampers (TMDs), which could passively be tuned according to the change of the degree of nonlinearity in steel buildings during earthquakes. Design properties for TMDs are composed of strength, stiffness and post-yielding stiffness. Optimal values for these properties are analyzed through stochastic analysis and closed forms of the optimal values are formulated. Finally, an estimation method for the peak displacement of buildings is proposed based on equivalent linearization techniques. The proposed method with hand calculation predicts quite accurate results compared to time history analysis.

TUNING STRATEGY OF HYSTERETIC MASS DAMPER FOR REDUCING INTER-STORY DRIFT BEYOND ELASTIC LIMIT OF STEEL BUILDINGS