Case Study: Tuned Mass Dampers for Pedestrian Bridge in Malmö
During the structural design of the pedestrian bridge at Bagers Plats in Malmö, it became obvious that it would require a TMD, as the lowest vertical was calculated to 1.85 Hz.
Vibratec designed a TMD solution: in total 2 TMD’s with a vibration mass of each 340 kg was installed in the mid section of the bridge.
Damping ratio of bridge with blocked TMD: 1.5 %
Damping ratio of bridge with TMD: 9.0 %
Due to the increased damping of the first vertical mode shape, the movements by walking persons are dampened, and the comfort criteria are met.
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Tuned Mass Damper – Low Frequency
Read MoreTuned Mass Damper – Low FrequencyTuned Mass Damper – Low Frequency
Read MoreTuned Mass Damper – Low FrequencyApplication types for Tuned Mass Dampers
Tuned mass dampers are usually implemented in the following typical application types:
Pedestrian bridges and staircases etc. which can be excited by jumping or walking. Primarily this is a comfort problem and not a structural problem.
Office floors and similar being excited either by jumping and walking or machinery may cause discomfort as well as structural problems.
Subsea oil & gas transmission lines. Excitations by wave loads
Tall and slender structures, like bridges, chimneys and towers which can be excited easily by wind causing dangerous situations for the structure.
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