Bridge Weigh-In-Motion System using Deflection Response
Keywords:
bridge weigh-in-motion, axle load identification, truck weight, bridge deflection responseAbstract
This research presents the bridge weigh-in-motion system to identify truck load from bridge deflection response instead of strain. The analysis employs a method of regularized least-squares with accuracy improvement by the updated static component technique applying the direct measurement influence line. The effectiveness is evaluated by numerical examples and statistical studies from computer simulation. The results reveal that analysis using deflection response performs better effectiveness than strain. The appropriate regularization parameter can be selected in the broader range with higher identification accuracy. Bridge surface roughness and measurement noise are significant parameters of system accuracy. The identification error varies to roughness amplitude and noise level. The error can be reduced by smoothening the pavement and using low-noise instruments or applying noise filtering. Using the deflection response is therefore an alternative option to strain that could have a distorted signal if the strain gauge is installed on the microcrack of the concrete surface.
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