Abstract

The Arup criterion5 for the lateral dynamic stability of footbridges under crowd loading is generalised using complex modes to the case of multiple modes and multiple tuned mass dampers. The procedure is applied to the design of the Infini ty Footbridge, Stockton-on-Tees, where three tuned mass dampers were incorporated to deal with three horizontal modes, whose frequencies were predicted by finite element analysis to lie below 1,5 Hz.

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