Experimental Testing of a Moving Force Identification Bridge Weigh-in-Motion Algorithm |
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Authors: | C. W. Rowley E. J. OBrien A. Gonzalez A. Žnidarič |
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Affiliation: | (1) Bridges, Buro Happold Ltd., 2nd floor, 27 Mortimer Street, London, W1T3JF, UK;(2) School of Architecture, Landscape and Civil Engineering, University College Dublin, Newstead Building, Belfield, Dublin 4, Ireland;(3) Slovenian National Building and Civil Engineering Institute, Dimičeva 12, SI-1000 Ljubljana, Slovenia |
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Abstract: | Bridge weigh-in-motion systems are based on the measurement of strain on a bridge and the use of the measurements to estimate the static weights of passing traffic loads. Traditionally, commercial systems employ a static algorithm and use the bridge influence line to infer static axle weights. This paper describes the experimental testing of an algorithm based on moving force identification theory. In this approach the bridge is dynamically modeled using the finite element method and an eigenvalue reduction technique is employed to reduce the dimension of the system. The inverse problem of finding the applied forces from measured responses is then formulated as a least squares problem with Tikhonov regularization. The optimal regularization parameter is solved using the L-curve method. Finally, the static axle loads, impact factors and truck frequencies are obtained from a complete time history of the identified moving forces. |
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Keywords: | Bridge Weigh-in-motion Force identification Regularization Dynamic programming Traffic loads |
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