Characteristics of four viscous damper models manufactured by IRANDAMP is listed below. To review further details about each product, and test results, visit PRODUCTS and GALLERY pages. Moreover, TECHNICAL POSTS contains comprehensive technical points about viscous dampers and other vibration control devices.


Model: Customized

Capacity: up to ±500 kN

Stroke: up to ±150mm

Damping coefficient: Unlimitted

Velocity exponent: 0.3~1

Weight: –

Model: IRD160

Capacity: ±500 kN

Stroke: ±120mm

Damping coefficient: Unlimitted

Velocity exponent: 0.3~1

Weight: 200 kg


Model: IRD125

Capacity: ±250kN

Stroke: ±120mm

Damping coefficient: Unlimitted

Velocity exponent: 0.3~1

Weight: 110kg


Model: IRD80

Capacity: ±100 kN

Stroke: ±60mm

Damping coefficient: Unlimitted

Velocity exponent: 0.3~1

Weight: 40 kg


Fluid viscous damper, also simply called viscous damper, can be implemented in buildings using different configurations. Here are some common configurations for these velocity-dependent energy dissipating devices. Note that some of the available configurations have amplification properties which means the imposed damper displacement can be amplified. This would also amplify energy dissipation of the damper and reduce total number of the required dampers. A fluid viscous damper has zero static stiffness and can be placed along the height of the building in a discontinuous manner. As a result, fluid viscous dampers are not required to be placed at all stories and also it is not necessary to continue viscous dampers down to the foundation. Optimal placement of the dampers can be obtained based on IRANDAMP’s exclusive algorithm which is programmed to achieve a target damping ratio determined by the designer. The final configuration and damper placement would be selected based on structural and architectural considerations

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Fluid viscous damper energy dissipating devices can be used in new construction and/or rehabilitation of existing RC and steel buildings. Here are some details of viscous damper connections to RC beam-column joints. Respect the fact that viscous dampers are velocity-dependent which means their force would be out-of-phase with internal forces of the main structural elements. Despite conventional braces, viscous dampers would not increase force demands on other structural elements, such as adjacent columns and beam-to-column connections

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Fluid viscous damper is a velocity-dependent device and add no constraint for thermal deformations of the deck. Using viscous dampers, bearing deformations, pier moments and shears, abutment and foundation demands, and deck acceleration would be simultaneously reduced in both transverse and longitudinal directions. It is safe to say that the most seismic-resilient system for highway bridges and overpasses is to use flexible seismic isolation bearings supplemented with pure viscous damping provided by viscous dampers. This super efficient technique has been used in many seismic prone countries. Due to the lightness of an average span bridge deck, a couple of medium sized viscous dampers can easily increase damping ratio of the bridge to about 40% at both transverse and longitudinal directions. Such a huge amount of damping cannot be achieved by the bearings themselves or other yielding/friction devices

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Viscous dampers can be used at the isolation level of seismically isolated buildings. Viscous dampers have zero stiffness and can inject pure viscous damping to the seismic isolation system. The result would be reduction in deformation demands on the isolation bearings without affecting lateral stiffness of the isolated layer. Thanks to the zero stiffness viscous dampers, isolation bearings with lower stiffness can be used without any increase in lateral deformation of the isolated layer

Further details are available in TECHNICAL POSTS


To reach to the most comprehensive and unique contents about viscous damper and the structures equipped with this superior vibration control technology, visit GALLERY and TECHNICAL POSTS pages.