Updating bridge axle loads using WIM in Switzerland
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Bibliographic Details
| Author(s): |
Matthew Sjaarda
(École Polytechnique Fédérale de Lausanne, Lausanne, VD, CH)
Alain Nussbaumer 
(École Polytechnique Fédérale de Lausanne, Lausanne, VD, CH)
Dimitrios Papastergiou (Federal Roads Office, Bern, BE, CH) |
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| Medium: | conference paper | ||||
| Language(s): | English | ||||
| Conference: | IABSE Congress: Structural Engineering for Future Societal Needs, Ghent, Belgium, 22-24 September 2021 | ||||
| Published in: | IABSE Congress Ghent 2021 | ||||
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| Page(s): | 748-756 | ||||
| Total no. of pages: | 9 | ||||
| DOI: | 10.2749/ghent.2021.0748 | ||||
| Abstract: |
The Eurocode LM1 for traffic loads on bridges features side-by-side tandem axles, as well as uniformly distributed lane loads. This LM is mirrored in the Swiss code SIA 261, for new structures, as well as SIA 269, for existing structures, where updating is permitted based on existing traffic in the form of updated alpha factors, αQ1 and αQ2. The research herein uses an extensive WIM database to update alpha factors for Swiss traffic. For the first (slow) lane, this is done using simple block maxima of tandem axle statistics (daily, weekly, and yearly block maxima results are compared) with log-normal fitting to the extreme value statistic. For the second lane, a novel approach is used which reconstructs real multiple-presence scenarios from the WIM data to predict the total joint load across both lanes. The result of the single lane and joint analyses are recommended updated alpha factors reduced by a factor of one third as compared to those mandated for new construction. |
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| Keywords: |
bridges reliability assessment traffic loads ultimate limit state Weigh-In-Motion axle
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| Copyright: | © 2021 International Association for Bridge and Structural Engineering (IABSE) | ||||
| License: | This creative work is copyrighted material and may not be used without explicit approval by the author and/or copyright owner. |
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