An equivalent modulus of elasticity approach for simplified modelling and analysis of a complex prestressed railway bridge
2009 (English)In: Advances in Structural Engineering, ISSN 1369-4332Article in journal (Refereed) Submitted
The use of measurements allows for updated analysis models that better represent actual bridge behaviour. This paper investigated the possibility of using an equivalent modulus of elasticity in simplifying the modelling of a complex prestressed railway bridge. The study involved several static load tests with a fully loaded macadam train and Swedish Rc6 locomotives. Vertical deflection and axial strain measurements resulted in an equivalent modulus of elasticity based on a linear elastic Bernoulli-Euler beam element model. Calculated axial strain was refined as the Vlasov portion of the torsional moment due to constrained warping was considered. Relatively large variations in results were found but the identified modulus range verified the modulus found in previous modal analysis. It was concluded that the complex bridge can be simplified in means of beam theory and one single updating parameter, the equivalent modulus of elasticity, and still produce reliable results for simplified global analysis.
Place, publisher, year, edition, pages
Modulus of elasticity, Modified Bernoulli-Euler beam axial stress, Constrained warping, Deflection, Static test loading, Measurements
IdentifiersURN: urn:nbn:se:kth:diva-11189OAI: oai:DiVA.org:kth-11189DiVA: diva2:241334
QS 201203152009-10-022009-10-022012-03-15Bibliographically approved