Study On Theory And Practice Of Health Monitoring Of Urban Overpass

A bridge's performance will continue to be degradation once it has been built and put into use. Bridge structure will inevitably be injured by vehicles, wind, earthquake, fatigue, overloading and other natural and man-made factors, which will lead to accumulative damage and sudden injury of the structure or members of the bridge. As a result, the service capacity of the bridge will reduce, which will threaten people's lives and property safety and bring on huge economic losses. Therefore, we should pay greater attention to bridges'the safety, reliability, durability and normal function in the operation period as well as focusing on building bridges. It is very necessary to establish health monitoring system to make sure the safety of the bridge. Study on theory and practice of health monitoring of overpass bridge in the city is carried out in the paper combined with national high technology research and development plan (863 project) named'Research of large range road disaster parameter monitoring and identification and early warning system in seasonal frozen region', main research work is as follows:1. Optimal placement of static sensors base on damage identificationEmplacing sensors at the bridge structure is the premise of bridge health monitoring. Due to economic factors and structural characteristics, it is impossible and unrealistic to place sensors in all degrees of freedom of the bridge. So an optimization problem on how to place m (m