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Demonstration and examination of a procedure for successively improved structural assessment of concrete bridges
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Structural and Fire Engineering. Department of Bridge and Hydraulic Design, WSP Sverige AB, Gothenburg, Sweden.ORCID iD: 0000-0001-8889-4237
2020 (English)In: Structural Concrete, ISSN 1464-4177, E-ISSN 1751-7648, Vol. 21, no 4, p. 1321-1344Article in journal (Refereed) Published
Abstract [en]

Assessing the load‐carrying capacity of existing bridges is an important infrastructure management task. In order to support the structural assessment of concrete bridges better, a procedure has been proposed, based on successively improving the bridge analysis. A multilevel strategy for structural analysis has been combined with concepts for verification of the desired safety margin, thus providing tools for engineers to model the structural behavior of bridges more accurately when necessary. This paper describes the procedure as applied to a prestressed concrete girder bridge, with use of experiences from the previous failure tests and associated evaluations of the bridge. Initial structural assessment indicated the critical failure mode to be due to shear in one of the girders; however, the enhanced analysis showed a complex failure involving both the girder and the bridge deck slab. Improving the structural analysis using nonlinear FE analysis for the loading initially identified as critical, increased the permitted axle loads on the bridge to 12 to 14 times those given by traditional and standardized assessment methods, depending on the concept used for safety verification. The model uncertainty was crucial for the verification of the structural safety and has to be properly taken into account. However, there are few recommendations, with regard to model uncertainties, on the application of nonlinear FE analysis, and detailed guidelines should be used for the modeling procedure in order to reduce analyst‐dependent variability in the results. The presented study demonstrates the applicability and the advantages of using the proposed procedure for successively improved analysis for bridge assessment.

Place, publisher, year, edition, pages
John Wiley & Sons, 2020. Vol. 21, no 4, p. 1321-1344
Keywords [en]
bridges, codes, multilevel assessment, nonlinear finite element analysis, prestressed concrete, probabilistic analysis, shear capacity, structural safety
National Category
Other Civil Engineering
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-76752DOI: 10.1002/suco.201900265ISI: 000492198700001Scopus ID: 2-s2.0-85074613291OAI: oai:DiVA.org:ltu-76752DiVA, id: diva2:1371206
Note

Validerad;2020;Nivå 2;2020-10-05 (alebob)

Available from: 2019-11-19 Created: 2019-11-19 Last updated: 2020-10-05Bibliographically approved

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Bagge, Niklas

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