Page 17 - DOUCE HYDRO 2013

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FVD: FluidViscous Dampers
ASR Series
Douce-Hydro/Jarret Structures’ damper is
designed to dissipate seismic or dynamic energy on a
structure. Douce-Hydro’s/Jarret Structures’ ASR series
dampers work in tension and compression. The dampers
can reduce longitudinal and transversal or vertical
displacement of a deck. They can be installed in different
type of structures, for example, longitudinally between
the deck and the abutment, or in transverse between the
deck and the pier structure of a bridge. They can equally
be installed in a building for brace or base isolation.
Seismic energy is dissipated into the damper unit instead
of being dissipated in the concrete or steel structure.
F = C.V α
BEHAVIOR LAW:
Working Principle:
Douce-Hydro/Jarret Structures’ viscous fluid damper works on the principle that rapid flow of viscous fluid
through a narrow orifice or port, generates high resistance, which then dissipates a large amount of energy.
The energy is dissipated in heat.
Force depends on velocity
Dynamic
Reaction
Reaction at
low velocity
x
F F = Pressure x Surface
F = (P1-P2) x Sdiff
(P1-P2) depends on flow intoVf, fixed by the
velocity.
P1, P2: internal pressure into the chambers
Vf: fluid velocity into the gap
Sdiff: surface of the piston where the pressure is
applied.
GENERAL
FVD: FLUIDVISCOUS DAMPER
STU: SHOCK TRANSMISSION UNIT
PSD: PRELOAD SPRING DAMPER
AVE SERIES
A