| Abstract: | This research study developed and quantitatively evaluated the concept of Bridge Weigh-In-Motion (BWIM) for future application on Texas highways. The primary objective of B-WIM systems is to instrument a bridge to obtain the axle information (i.e., weights, number, speed, and spacings) and weight information (i.e., axles and gross) of trucks that cross the structure. A secondary objective of B-WIM is to evaluate the bridge itself. The challenge of B-WIM is to accurately obtain this information through robust sensing technology and post-processing algorithms. B-WIM (compared to pavement WIM) is potentially less disruptive to traffic, more durable, more economical, safer to install, and able to produce accurate trucktraffic data and bridge assessment information. This project realized these advantages through the development of a B-WIM system that included extensive experimental testing followed by field validation on in-service bridges. The system was able to accurately identify truck axle and weight information. In addition, the project developed an approach to identify bridge parameters, such as distribution factors and composite action from B-WIM data. The final bridge evaluations included refined site-specific load ratings. The project team initially reviewed the relevant literature and the current state of the practice. Next, a preliminary B-WIM system was developed and tested on a testbed bridge. Three in-service bridges were selected, and B-WIM systems for each bridge were developed and deployed. Data were collected and utilized for live load analysis and validation through an independent portable pavement WIM system. Each corridor was evaluated based on the B-WIM results, and the bridges were evaluated with refined load ratings. Finally, guidelines for future B-WIM implementation were developed. |
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