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Wide span structures such as bridges, stairs, and roofs, as well as tall, narrow structures such as chimneys, antennas, masts and buildings, can be easily excited to high vibration amplitudes in their first or higher eigenforms. Excitations can be caused by wind forces, pedestrian traffic, machinery or earthquakes. Natural frequencies and damping are typically low for these structures. With GERB tuned mass dampers (TMD), these vibrations can be easily reduced.
All GERB TMD's, both vertical or horizontal have three main components: Spring or pendulum - Oscillating Mass - Viscous fluid damper.
Every TMD is exactly tuned to the main natural frequency of the structure. Although TMD's have been well-known for a long time, it is still difficult to provide exact tuning and predefined system damping. Furthermore, the three components must not change their dynamic properties overtime, even when exposed to variable weather conditions. GERB has worldwide sucess in designing and manufacturing TMD's with masses from 20 to 10,000Kg, and vibration frequencies from 40 to as low as 0.3Hz.
To protect against vertical vibrations, GERB TMD's are equipped with helical compression springs and Viscodampers. For horizontal and torsional vibrations, GERB supplies TMD's with leaf springs or pendulums, and Viscodampers.