Health Monitoring Strategy for Bridge Considering Vehicle-Bridge Interaction

The monitoring strategy for bridges considering signal-to-noise ratio and vehicle-bridge interaction is proposed in order to discard a large amount of low signal-to-noise ratio data or normal data. The composition of the vibration signal is discussed, and the reasonable and accurate monitoring threshold should be determined according to vehicles-bridge interaction dynamics. A time-varying dynamic vehicle group model, which includes main uniform parameters and coupling mass, is established. The dynamic coupling equations for bridge and car groups are established, and the analytical expression is given. The health monitoring for a simply-supported beam is discussed. The dynamic response under different uniform mass, speed, and vibration frequency of the car group is analyzed based on the vehicle-bridge interaction theory. The monitoring threshold is determined according to simulated results and measured signals.