SIMPLIFIED STRATEGIES OF FLUID VISCOUS DAMPERS’ (FVDs) DESIGN FOR IN-PLANE AND IN ELEVATION IRREGULAR HYSTERETIC HIGH-RISE STRUCTURES

Among the strategies for the optimal design of Fluid Viscous Dampers, there is a procedure based on a simplified approach consisting in considering, as one of the hypotheses, the dynamic response of a structure governed by the first modal shape. The above-mentioned approach is addressed to elastic structure but, more important, also to hysteretic existing buildings and takes, during the design stage, the hysteretic dissipative capacity into account. Moreover, this approach has been validated for low-rise and mid-rise in-plane behaviour structures and results show that effectiveness is proved with a high probability of success. The present work investigates the possibility of applying this strategy to high-rise buildings irregular in-plane and in elevation and, in general, aims to prove its level of effectiveness. In detail, the approach here discussed is based on specific assumptions, for which low-rise and mid-rise in-plane behaviour structures are consistent with. But, in order to provide the reliability of the strategy on structures that do not satisfy these initial hypotheses, the simplified procedure is applied to benchmark models, subjected to appropriate families of base accelerograms, representatives of high-rise buildings irregular in-plane and in elevation, whose dynamic response is not always governed by the first modal shape. A comparison between the obtainable results and the design targets is carried out through time history analyses performed on FVDs-equipped (and non) structural nonlinear models, by a statistical analysis.