Seismic Protection Of Bridges Using
Viscous Dampers
Author(s)
M. Spizzuoco, G. Serino & C. Onorii
Abstract
The proposed paper deals with the seismic protection of bridges by means of
passive energy dissipation viscous devices installed between the continuous
beam deck and the supporting piers. An analytical approach is used to study the
problem and a simple design procedure, using the frequency response analysis, is
provided to determine the optimal value of the viscous damping parameter
characterizing the dampers. Finally, the adequacy of the procedure is verified
through time history analyses on an existing bridge.
Keywords: bridges, retrofit of bridges, viscous devices, passive control.
1 Introduction
The most recent bridges’ seismic design procedures, which are essentially related
to the concepts of performance-based and damage-controlled design, have made
clear that the only increase of the design force levels does not improve the
earthquake bridge performance. The preferential innovative strategy for
controlling excessive vibrations induced by earthquake loads in new bridge
structures (design perspective) as well as in existing ones (retrofit perspective), is
the use of supplemental energy dissipation systems. They generally require a
relative movement in the structure to activate the dissipation devices. The aim of
incorporating supplemental damping devices in the design or retrofit of a bridge
structure is the reduction of the dynamic response amplification. This is obtained
by increasing the structural equivalent viscous damping according to the
response spectra of the earthquake record at the site. In fact, the addition of a
supplemental damping to a structure is more beneficial if the fundamental period
of the construction including the damping devices falls within the range where
Keywords
bridges, retrofit of bridges, viscous devices, passive control.
Related Book
Other papers in this volume
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