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X-Bridge aims to survey metal bridges with range-based and X-based sensors in order to record and monitor movements, deformations and internal stresses of metal structures. The 3D data acquired with laser scanning are used for the monitoring process, to perform FEM analysis and as "container" for the visualization of all the 3D structure. The X-ray are used to assess the presence of overloaded areas in steel bridges. The methodology is based on the principle that if the load applied (also just once) in a particular area is higher than the yield strength, it changes the residual stress in this area, inducing a different value of stress if compared with the other areas not overloaded. Using X-Ray diffraction it is possible to detect the value of residual stress on the surface of metals, also in small areas, in a non-destructive way.
- Marconi, G.P., Remondino, F., Jimenez Fernandez-Palacios, B., Cozzini, M., 2012: X-Bridge Project: development of a new methodology for the monitoring of steel bridges. In "Applied Mechanics and Materials", Vol. 256-259, pp. 1537-1541. Proc. 2nd International Conference on Civil Engineering and Transportation (ICCET 2012), Guilin, China