The conventional seismic design, based on a combination ofstrength, ductility and energy dissipation of principal structural members,understands the strong motions, such as earthquakes, as loads at which thestructure must resist and remain functional, accepting a certain level of structuraldegradations. While this method based on strength-ductility-energy dissipationcan prevent big damages, it is difficult to rehabilitate plastic hinges developed instructural members during a strong seismic action. On the contrary, the conceptof a structure with supplemental viscous fluid dampers assumes that the mostdissipation energy demand is absorbed by these devices, not by the structureitself, and the damages are mainly localized and concentrated on the devicesduring earthquakes. The main objective of this paper is to present some ofpassive viscous fluid dampers and numerical results of a single degree offreedom (SDOF) system protected with such supplemental energy dissipationdevices.
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