EFFECTIVENESS OF SUPPLEMENTARY DAMPERSFOR ISOLATED BRIDGES UNDER STRONG NEAR-FIELDGROUND MOTIONS

摘要

Seismic isolation has been extensively used worldwide for bridges. Considerable progress has been madein control methods of civil engineering structures subjected to environmental loads in the past twodecades. However, in most studies, structures except isolators are assumed to be linear elastic. This papershows the efficiency of supplementary dampers with control strategies to mitigate the large deckdisplacement and the hysteretic behavior of column under strong near-field ground motions.Magnetorheological dampers (MR-dampers) may be used to produce arbitral damping force vs. bridgeresponse relations. Both external and internal damper allocations are implemented to evaluate thedifference of performance.