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A filtering-based bridge weigh-in-motion system on a continuous multi-girder bridge considering the influence lines of different lanes |
Hanli WU1,2, Hua ZHAO1(), Jenny LIU2, Zhentao HU3 |
1. Key Laboratory for Wind and Bridge Engineering of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China 2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA 3. Qingyuan Traffic and Transportation Bureau, Qingyuan 511500, China |
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Abstract A real-time vehicle monitoring is crucial for effective bridge maintenance and traffic management because overloaded vehicles can cause damage to bridges, and in some extreme cases, it will directly lead to a bridge failure. Bridge weigh-in-motion (BWIM) system as a high performance and cost-effective technology has been extensively used to monitor vehicle speed and weight on highways. However, the dynamic effect and data noise may have an adverse impact on the bridge responses during and immediately following the vehicles pass the bridge. The fast Fourier transform (FFT) method, which can significantly purify the collected structural responses (dynamic strains) received from sensors or transducers, was used in axle counting, detection, and axle weighing technology in this study. To further improve the accuracy of the BWIM system, the field-calibrated influence lines (ILs) of a continuous multi-girder bridge were regarded as a reference to identify the vehicle weight based on the modified Moses algorithm and the least squares method. In situ experimental results indicated that the signals treated with FFT filter were far better than the original ones, the efficiency and the accuracy of axle detection were significantly improved by introducing the FFT method to the BWIM system. Moreover, the lateral load distribution effect on bridges should be considered by using the calculated average ILs of the specific lane individually for vehicle weight calculation of this lane.
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Keywords
bridge weigh-in-motion
continuous bridge
fast Fourier transform
influence line
axle weight calculation
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Corresponding Author(s):
Hua ZHAO
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Just Accepted Date: 10 July 2020
Online First Date: 08 September 2020
Issue Date: 16 November 2020
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