Feasibility of viscous mass damper with bingham fluid origined force restriction mechanism for base-isolated structure

Viscous mass dampers with friction origin force restriction mechanism are considered for base isolated structures. From a series of analytical studies, these viscous mass dampers can reduce the displacement of the base isolation layer, but they cannot reduce the floor response acceleration of the superstructure depending on the input ground motions. To improve the damper, viscous mass dampers with bingham fluid origin force restriction is suggested. The suggested damper can reduce the floor response acceleration compared to the previous dampers for several input ground motions. The difference of the response for both dampers is considered from the time history analysis and response spectra. It is cleared that the suggested damper had better performance for the isolation effect compared to the viscous mass dampers with friction origin force restriction mechanism and the conventional oil dampers.