The basic connotation of bridge health monitoring is to send out early warning signals for the bridge under special climate, traffic conditions or abnormal operation conditions by monitoring and evaluating the bridge structure, and provide basis and guidance for the maintenance and management decision-making of the bridge. However, the health monitoring of bridge structure is not only to monitor and evaluate the state of the structure, but also the far-reaching significance of its information feedback in structural design is that it can improve the structural design method and the corresponding norms and standards. In addition, bridge health monitoring brings not only a monitoring system and reflection on a specific bridge design, but also a "field laboratory" for bridge research. Bridge health monitoring provides a new opportunity for the unknown problems in bridge engineering and the research of super-long-span bridges. The information obtained from bridge structure and its operating environment is not only a supplement to theoretical research and laboratory investigation, but also provides the most authentic information about structural behavior and environmental laws. Therefore, bridge health monitoring is not only a new technology of traditional bridge detection and structural evaluation, but also endowed with triple significance of structural monitoring and evaluation, design verification and research and development.
In recent years, the continuous development of communication network, signal processing, artificial intelligence and other technologies has accelerated the practical process of bridge monitoring system. The industry has begun to develop a variety of flexible, efficient and cheap long-term monitoring methods or technologies that do not affect the normal use of bridge structures. The deployment and application of bridge health monitoring system not only has important practical significance, but also has important research value, which plays a positive role in promoting and developing the intelligence, digitalization and informatization of bridge engineering.