Monitoring of Bridges Damage Based on the System Transfer Function Maps from Sensors Datasets

To ensure the normal service of the bridge, it is necessary to detect and evaluate the health status of the bridge structure. This work provides a novel framework for damage detection in trusses bridges through analyzing of displacement sensors datasets and plotting the frequency maps of bridge system transfer function (TF). First, the bridge finite element model under random load is analysis, and the cumulative damages are considered and introduced to bridge model. The datasets of the sensors installed in bridge are compiled in both static and transient types. Finally, the bridge structure TF is determined by applying the principles of open loop control system on bridge structure and then plotting the frequency maps. The results show that the system becomes unstable in frequency maps when damage evolves in bridge structure.