Static Safety Inspection of Yanjiang Expressway Bridges

The core goal of static safety testing is to determine whether the structural performance of the bridge under conventional loads meets design requirements, and to identify potential structural defects or risks. Through static strain, displacement and possible crack monitoring of the key structural parts of the bridge, the load-bearing capacity and safety performance of the bridge can be effectively evaluated.

In this testing process, the Haytham offline visual tracker or similar high-precision non-contact measurement equipment can be used. Through advanced subpixel positioning algorithms and high-speed imaging technology, such equipment can accurately capture displacement and strain changes at key parts of the bridge without arranging targets on the structure, greatly reducing interference with the bridge surface.

Specifically, testing personnel can set up monitoring areas at key nodes of the bridge, such as piers, main girders and connections, and acquire bridge image data under static loading through high-speed digital cameras. Then, the oblique optical axis DIC technology is used to analyze the displacement and strain distribution in the images, accurately calculating the horizontal and vertical displacements of the bridge under loads, stress concentration areas and possible micro-cracks.

With these precise data, engineers can comprehensively evaluate the structural state of the bridge, determine whether there is deformation or stress concentration beyond the design range, and judge whether maintenance or reinforcement measures are needed. The results of static testing not only provide a scientific basis for the daily maintenance of the bridge, but also lay a foundation for future dynamic load testing and long-term monitoring.