Damper force: 0.05–300 tonf
Stroke: ±20 to ±800 mm
Velocity exponent (α): 0.1–1.0

C and α could be customized according to the requirement.

01 | Wide Range of Specifications Precisely Matched to Structural Requirements
The damping coefficient and stroke can be customized according to the structure’s dynamic characteristics, while standardized interface design ensures fast and accurate on-site installation.

02 | Stable, Full Hysteretic Energy Dissipation
The hysteresis loops are stable and symmetrical, and the energy dissipation behavior is predictable, facilitating structural analysis model development and seismic performance verification.

03 | No Additional Structural Demand
Displacement and force are 90° out of phase. When displacement reaches its maximum value, the damper force approaches zero, preventing the energy dissipation process from generating additional forces at beam-column joints.

04 | Energy Dissipation Across the Full Velocity Range for Continuous Structural Protection
Energy dissipation is activated even by very small deformations. From minor wind-induced disturbances to severe seismic impacts, FVDs effectively control structural sway.

・High-Rise Residential and Office Buildings:
FVDs effectively control floor sway caused by earthquakes and strong winds, significantly improving residential and workplace comfort. The energy dissipation process does not generate additional forces at beam-column joints, allowing FVDs to be incorporated without altering the original structural design.

・Seismic Retrofitting of Existing Buildings:
FVDs can be integrated into existing structural frames without requiring occupants to relocate during construction, making them an excellent solution for strengthening older buildings and urban renewal projects.

・Hospitals, Mechanical Rooms, and Other Critical Facilities:
In critical buildings that must remain operational after an earthquake, FVDs can significantly reduce the risk of nonstructural damage and equipment displacement, helping ensure that the building can continue performing its emergency-response functions during a disaster.

1. Alloy steel

2. High-strength stainless steel rod

3. Non-toxic silicone-based fluid

Q: Does installing an FVD increase the force demand on beam-column joints in the same way as conventional steel braces?
A: The force generated by an FVD is 90° out of phase with displacement. When displacement reaches its maximum, the damper force is at its minimum. It therefore does not add peak force demand at the same instant that the structure experiences maximum displacement, making it particularly well suited to existing beam-column joints.

Q: Do fluid viscous dampers require regular maintenance?
A: Under normal operating conditions, virtually no routine maintenance is required. A visual inspection every five years is generally sufficient. If the building has experienced a major earthquake, a post-earthquake functional assessment by a qualified professional engineer is recommended to ensure that the device continues to perform effectively.

Q: Will the damper operate when a building sways in strong winds? Will it generate noise?
A: Conventional dampers often use pinned connections. Clearance within these connections can cause metallic impact noise during structural movement and may limit their effectiveness under small-amplitude vibrations. WELL-LINK FVDs use spherical-joint technology to achieve a true zero-clearance fit. Whether responding to strong winds or earthquakes, they operate with exceptionally low noise, minimizing disturbance to building occupants.