Bridge Weigh-in-Motion

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The main objective of the proposed research program is to develop a new bridge Weigh in Motion (BWIM) system to calculate vehicle parameters such as truck speed and gross vehicle weight. In a realistic bridge design code, the design live loads should be based on actual traffic loads. In the past, the information about the actual traffic loads on highway bridges was obtained from truck surveys, in which the trucks are stopped for measurement and weighed on 'static' weighing scales. During the past few decades, the information about the truck loads has been collected while the trucks are moving at normal speeds. Some of the weighing-in-motion (WIM) scales are installed in the pavement. In other WIM systems, a highway bridge is used for the weighing-in-motion of the trucks; this latter system is referred to as the bridge WIM (BWIM) system, and the system installed in the pavement as simply the WIM system. Over the past few decades, a number of BWIM systems, with varying degrees of accuracy in predicting the axle and gross vehicle weights of the trucks, have been introduced. Two important factors in deciding upon the selection of an appropriate BWIM system are its cost and the accuracy of its prediction. The pavement WIM systems, invariably proprietary and more expensive than the BWIM systems, are usually assumed to be more accurate than the BWIM systems. The accuracy of the BWIM technology developed in this proposed research program will be established through a number of field calibration tests on a bridge in Manitoba.