Lateral Parametric Vibration of Footbridge under Pedestrian Excitation considering the Time-Delay Effect

<div>The relationship between phase angle and mass ratio of pedestrian and bridge motions under different damping ratios. (a) Positive phase angle. (b) Negative phase angle.</div>

Advances in Civil Engineering

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Figure 8

Figure 8: Lateral Parametric Vibration of Footbridge under Pedestrian Excitation considering the Time-Delay Effect 