Our dampers resist dynamic motion and remove energy from a structure during wind or seismic events, allowing it to withstand harsh input energy and reduce harmful deflections, forces and accelerations to structures and occupants.
37 special Dampers developed for NASA used for mitigation of lateral pedestrian vibrations.
Force range: 2250 – 4500 lbs.
Stroke capacity: +/-1.0 inch to +/- 11.0 inches. Effective damping to amplitudes less than .002 inches.
Design life: Greater than 60 years with no maintenance.
146 Fluid Viscous Dampers with various force and stroke capacity for seismic protection.
Output forces: Up to 790,000 lbs.
Stroke capacities up to: +/- 16.5 inches.
New cable-stayed bridge uses 146 Fluid Viscous Dampers in approach spans and at suspension span between piers and deck to dissipate seismic energy. This replacement bridge (replaces an aging, tied-arch bridge) boast a 470 meter main span, the second longest in the Western Hemisphere, and a 50 meter wide deck - the widest of any cable stayed bridge in the world.
Lock-up devices allow unrestricted motion when the bridge structure slowly expands and contracts thermally, yet locks the structural masses together under seismic or wind storm conditions.
32 seismic Lock-Up Devices.
Output force: Varies up to 337,000 lbs.
Stroke capacity: Varies up to +/-6 inches.
LUD’s protect existing bridge from seismic activity and distribute forces while allowing free movement for thermal variations.
84 seismic Shock Transmission Units for multiple sections of Seattle’s central link light rail.
Output force: Varies up to 650,000 lbs.
Stroke capacity: Varies up to +/- 6 inches.
New light rail line from Seattle through SEA-TAC International Airport utilizes shock transmission units to control seismic movement while allowing free thermal movement. Sections C755, C410, South 160th Loop and S440 South 200 Link all utilize these devices.
Tall slender buildings require damping. Tuned mass dampers are a great option to provide this supplemental damping. Our tuned mass dampers control the response of a building’s mass and springs, reducing acceleration when subjected to high winds. Tuned mass dampers can also be used to reduce pedestrian induced vibrations in pedestrian bridges and long span floors as well as human induced vibrations in stadiums and theaters.
16 long stroke Fluid Viscous Dampers for tuned mass dampers.
Damper force: 30,000 lbs.
Stroke capacity: +/-40 inches.
Damper power capacity: Greater than 4.0 HP.