Design of a TMD solution to mitigate wind-induced local vibrations in an existing timber footbridge

The design of a passive control solution based on tuned mass dampers (TMD’s) requires the estimation
of the actual masses involved in the undesired vibration. This task may result not so straightforward as expected
when the vibration resides in subsets of different structural components. This occurs, for instance, when the goal is to
damp out vibrations on stays. The theoretical aspects are first discussed and a design process is formulated. For sake
of exemplification, a multiple TMD’s configurations is eventually conceived for an existing timber footbridge
located in the municipality of Trasaghis (North-Eastern Italy). The bridge span is 83 m and the deck width is 3.82
m.