A Hysteretic Device System is a special kind of passive control system suitable for earthquake protection of structures. Its most important feature is a Seismic Link where Hysteretic Devices (Hydes) are located. In many bridges, such links naturally exist between columns and superstructure and have been used to place Base-Isolation Devices. This paperpresents a comparative study between Base-Isolation (BI) and Hysteretic Device System in an elevated rail track under Kobe type of earthquakes. Based on 500 generated earthquake records, standard deviations of link displacements and column top displacements are computed in the time domain allowing for a direct comparison based on an equal probability of survival. It is shown that Hyde Systems are more versatile and produce far less displacements and are therefore superior in performance than BI Systems.
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