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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Institution: | (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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