Contactless Bridge Weigh-in-Motion

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Title: Contactless Bridge Weigh-in-Motion
Authors: Ojio, T.
Carey, Ciaran
O'Brien, Eugene J.
Doherty, C.
Taylor, Su E.
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Date: Jul-2016
Online since: 2016-10-13T11:29:24Z
Abstract: Bridge weigh-in-motion (WIM) uses existing bridges to find the weights of vehicles that pass overhead. Contactless bridge weigh-in-motion (cBWIM) uses bridges to weigh vehicles without the need for any sensors to be attached to the bridge. A camera is mounted on the back of a telescope, which magnifies the image to the extent that submillimeter bridge deflections can be measured accurately. A second camera is used to monitor traffic and to determine axle spacings. The two cameras are synchronized using light-emitting diodes (LEDs) activated by an interval timer. The exact position of the test vehicle relative to the bridge influence line is determined by optimization at a post-processing stage. The new WIM concept was tested on a bridge in the United Kingdom. In a modest test sample of eight statically weighed vehicles, cBWIM was shown to be a feasible alternative to other forms of WIM. Accuracy of gross weight is already reasonably good; accuracy of groups and individual axles will require greater magnification or additional cameras.
Funding Details: Irish Research Council
Science Foundation Ireland
Type of material: Journal Article
Publisher: American Society of Civil Engineers
Journal: Journal of Bridge Engineering
Volume: 21
Issue: 7
Copyright (published version): 2016 ASCE
Keywords: BridgeWIMContactlessDeflectionImage
DOI: 10.1061/(ASCE)BE.1943-5592.0000776
Language: en
Status of Item: Peer reviewed
Appears in Collections:Civil Engineering Research Collection

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