42 X. Wei et al. 10 (a) (b) (c) 20 30 40 50 0 1 x z y 10 20 30 40 50 x y 10 20 30 40 50 0 1 x z Fig. 5.8 The first vertical bending dominated mode (f D0.96Hz, D2.49%) 10 20 30 40 50 0 1 0 0.5 x y z 10 20 30 40 50 0 1 x y 10 20 30 40 50 0 0.5 x z (a) (b) (c) Fig. 5.9 The first lateral bending dominated mode (f D1.08Hz, D0.31%) the first of these modes, which has an exceptionally low damping ratio of 0.31%. Despite the potential for a number of modes being excited by pedestrians we find the bridge’s vibration performance to be satisfactory. Contributing to this good serviceability performance is the reasonable level of damping in almost every mode and the potential interaction between simultaneously excited modes. The vibration response of the bridge to a range of human actions is going to be subject to new work by the University of Warwick team.
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