Assessment of optimal design methods of viscous dampers

Domenico Altieri, Enrico Tubaldi, Edoardo Patelli, Andrea Dall'Asta

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Abstract

Viscous dampers are often used for seismic protection and performance enhancement of building frames. The optimal design of such devices requires the modelling and propagation of the uncertainties related to the earthquake hazard. Different approaches are available for the seismic input characterisation and for the probabilistic response evaluation.
This work analyzes the effect of different characterizations of the seismic input and of the response evaluation on the design of dampers for building frames. The seismic input is represented as a stochastic process and the optimal damper properties are found via a reliability-based design procedure aiming at controlling the frame performance while limiting the damper cost.
Two simplified approaches are used to design the viscous damper of a multi-storey steel frame and the design results are compared with those obtained by considering a rigorous design approach resorting to advanced simulations for the response assessment. The first methodology evaluates the response through a prefixed probabilistic demand model, while the second approach considers the average response for a given hazard level only. The comparison allows to evaluate and quantify the effect of the seismic input uncertainty treatment on the system and damper performances.
Original languageEnglish
Pages (from-to)1152-1157
Number of pages6
JournalProcedia Engineering
Volume199
Issue numberSupplement C
Early online date12 Sep 2017
DOIs
Publication statusE-pub ahead of print - 12 Sep 2017
EventX International Conference on Structural Dynamics, EURODYN 2017 - Rome, Italy
Duration: 10 Sep 201713 Sep 2017

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Keywords

  • viscous dampers
  • stochastic seismic input
  • earthquake hazard
  • structural optimisation

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