Abstract
A bridge Weigh-in-Motion (WIM) system consists in estimating gross vehicle weight while they cross a bridge, without any sensor in the pavement. It comprises a set of sensors installed under the bridge deck and in bridge elements, and dedicated data analysis tools, allowing to assess the moving loads from the mechanical response of the bridge structure. In this paper, a novel Bridge WIM solution is described, which uses a low number of optical strands strain sensors, and has been implemented on 13 bridges worldwide. The accuracy of this system for gross vehicle weight is assessed on two bridges in France and Italy. The system met the accuracy class A(5) of the COST323 specifications on one bridge. Moreover, the data collected by the system is useful also for the structural health monitoring of the bridge.
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