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Seismic Performance Of Buildings Retrofitted With Nonlinear Viscous Dampers And Adjacent Reaction Towers

N. Impollonia, A. Palmeri
Published 2018 · Engineering

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An effective strategy of seismic retrofitting consists of installing nonlinear viscous dampers (NLVDs) between the existing building, with insufficient lateral resistance, and some auxiliary towers, specially designed and erected as reaction structures. This allows improving the seismic performance of the existing building without any major alteration to its structural and non- structural elements, which makes this approach particularly appealing for buildings with heritage value. In this paper, the nonlinear governing equations of the coupled lateral-torsional seismic motion are derived from first principles for the general case of a multi-story building connected at various locations in plan and in elevation to an arbitrary number of multi-story towers. This formulation is then used to assess the performance of the proposed retrofitting strategy for a real case study, namely a five-story student hall of residence in the city of Messina, Italy. The results of extensive time-history analyses highlight the key design considerations associated with the stiffness of the reaction towers and the mechanical parameters of the NLVDs, confirming the validity of this approach
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