Example 1 Bellagrio Bridges Las Vegas, Nevada   Bellagio Bridge, Las Vegas   *** Two bridges, spanning 46 and 38 meters long.*** *** A damping system was installed to avoid the possibility of exciting the bridges to resonance, which would have caused an amplitude large enough for pedestrians to feel.***   The Tuned Mass Damping System on one side of the Bridge   *** The bridge uses 6 TMDs, 3 on each bridge, and weighing1360 kg apiece.*** *** Like most TMDs, each of the 6 TMDs have springs and a viscous damper, through which vibration energy of the bridge is dissipated.***     "Architectural and engineering design constraints created a need for a damping system to absorb the energy from pedestrian movements on the Bellagio bridges. Three tuned mass dampers were installed within the girders on each side of each span."