As a stay cable gets longer (80 meters or more), it is subject to increased vibrations: these vibrations may frighten users and will cause the cable to wear out over time. The dampers’ role is to dissipate kinetic and elastic energy. VSL has developed two vibration damping systems that are both highly efficient and durable, with low maintenance costs.

Modeling of vibration effects

The mechanisms of dynamic excitation are complex and their reliable prediction is difficult. VSL has developed simulation tools to assist designers in assessing the risk of cable vibrations and propose suitable mitigation measures, for both new bridges and existing bridges.

Two damping systems

In addition to adapted VSL-designed stay pipes profiles to better control the risk of rain-wind induced vibrations, VSL has developed two damping devices that increase the structural damping ratio of the cable.

  • The VSL Friction damper is a highly efficient and durable damper for more critical applications, such as long cables or structures with an increased risk of vibration.
  • The VSL Rubber damper is a modular and robust damper optimised for short to medium length stay cables with moderate damping requirements and for extradosed cables.

Both types can be installed either at construction stage or as a retrofit add-on.

Extreme durability of dampers for cable-stayed bridges

VSL dampers’ outstanding durability is achieved by:

  • minimizing the number of movable parts, which reduces the wear and tear,
  • utilizing dissipation mechanisms that employ stable solid materials instead of fluids.

Easy maintenance

The damper configurations provide an easy access for inspection and maintenance operations. All components can be dismantled and/or replaced on site using light tools and equipment, with minimum impact on the bridge’s operation.

Versatility of dampers for cable-stayed bridges

Both damper types are optimized for use as internal dampers, fully protected inside the VSL SSI 2000 anti-vandalism pipe, but they can also easily be adapted for retrofitting solutions or use as external dampers if required.

VSL services

The compact and highly-efficient nature of VSL dampers allow installation close to the deck anchorage, where they are incorporated into the SSI 2000 System as internal dampers, fully protected inside the anti-vandalism pipe.

Enhanced aesthetics

  • Analysis of stability risk
  • Proposal of mitigation measures, including provision of dampers
  • Estimation of the behaviour of the damper-equipped cables, taking into account excitation by aerodynamic effects and structural coupling
  • Design, fabrication, workshop testing, supply and installation the damper system
  • Full integration on-site including fine-tuning of damping devices after installation, to match the actual characteristics of cable and structure
  • Retrofitting solutions for existing strand and parallel wire cables


Discover our Case Studies

Here is a selection of our references.
MEXICO, Mexico
KRAKOW, Poland

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