System background of bridge health monitoring system

However, in the process of bridge construction and use, due to the erosion of environment and harmful substances, the influence of vehicles, wind, earthquake, fatigue and human factors, and the continuous deterioration of materials, all parts of the structure have been damaged and deteriorated to varying degrees long before reaching the design life. If these damages cannot be found and repaired in time, it will affect traffic safety and shorten the service life of the bridge, and even lead to sudden damage and collapse of the bridge. According to statistics, 28.6% of the nearly 600,000 bridges in the United States have insufficient performance and functional defects. In the United States, 90% of annual bridge investment is used to update and repair old bridges, and only 65,438+00% is used to build new bridges.

There are more than 5,000 highway bridges in China, with a total length of 6.5438+0.3 million kilometers. Bridges above 654.38+0/3 have hidden dangers of structural defects, damage to different degrees and functional failure. In recent years, there have been many major bridge accidents in China. These accidents are related to many factors, but the lack of effective monitoring measures and necessary maintenance measures is one of the important reasons. These shocking accidents make people pay more attention to the quality and life of modern bridges. The quality inspection and health monitoring of bridge structure has become a hot topic in academic and engineering circles at home and abroad.

Traditional bridge inspection relies on the experience of managers and technicians to a great extent, and lacks scientific and systematic methods, and often lacks a comprehensive grasp and understanding of the situation of bridges, especially large bridges, and the information cannot be fed back in time. If the disease of the bridge is underestimated, it is likely to lose the best opportunity for maintenance, speed up the process of bridge damage and shorten the service life of the bridge. If the disease of the bridge is overestimated, it will cause unnecessary waste of funds and make the bearing capacity of the bridge unable to give full play.