Microsimulation Evaluation of Eurocode Load Model for American Long-Span Bridges
Publication: Journal of Bridge Engineering
Volume 18, Issue 12
Abstract
The ability to accurately predict traffic loading is essential for cost-effective bridge maintenance and repair programs. The traffic load model currently used in the United States for the design of long-span bridges was developed over three decades ago. In the meantime, vehicle characteristics and traffic patterns have changed. The Eurocode for traffic loading is more recent, but was calibrated only for bridges up to 200 m long. In this work, weigh-in-motion traffic records from 11 different sites across Alabama are used to establish congested traffic loading. Traffic microsimulation is used to generate congestion based on real traffic data. Influence lines for two typical long-span bridges, one cable-stayed bridge, and one suspension bridge are determined using finite-element models. These are used in the microsimulation model to estimate the bridge-load effects caused by congested traffic. These results are extrapolated to find the characteristic lifetime maximum values that are used to evaluate the Eurocode load model to assess its suitability for long-span bridges. In a similar way, the current American load model for long-span bridges, commonly known as the ASCE model, is evaluated to see if it accurately reflects the congested traffic loading that is currently found on American highways. Recent research has suggested the use of the AASHTO HL-93 load model to estimate the effects of traffic loading on long-span bridges, and this model is also evaluated in this work.
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Acknowledgments
The authors would like to acknowledge the Dublin Institute of Technology ABBEST Scholarship Programme for funding this research and also the Alabama Department of Transportation and the Ontario Ministry of Transportation for supplying the WIM traffic data.
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Information
Published In
Journal of Bridge Engineering
Volume 18 • Issue 12 • December 2013
Pages: 1252 - 1260
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 24, 2013
Accepted: Jul 25, 2013
Published online: Aug 12, 2013
Published in print: Dec 1, 2013
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