Optimized model updating of a railway bridge for increased accuracy in moving load simulations
2012 (English)In: Infrastructure Design, Signalling and Security in Railway, InTech, 2012, 203-224 p.Chapter in book (Refereed)
The requirement of analyzing passing trains at high speeds in detail according to railway bridge design codes calls for time efficient and simplified FE models in some sense. This paper uses an optimized updating method based on load tests and statistically identified updating parameters. A large-scale simplified railway bridge FE model of a complex and continuous long span prestressed bridge is optimized for more time efficient and accurate load effect predictions. In addition, a benchmark test is presented to demonstrate the high potential of the adopted Nelder-Mead simplex optimization algorithm. The algorithm shows to operate efficiently and the accuracy in load effect predictions is considerably improved. High speed train model simulations are performed with the optimized FE model and more accurately predicted load effects are exemplified. The high potential FE model updating procedure is used traditionally, based on measurements, but the relevant area of introducing it in the early bridge design phase is discussed.
Place, publisher, year, edition, pages
InTech, 2012. 203-224 p.
Optimization, Finite element method, Model verification, Bridge tests, Moving loads, Simulation, Railway bridge
IdentifiersURN: urn:nbn:se:kth:diva-11193ISBN: 978-953-51-0448-3OAI: oai:DiVA.org:kth-11193DiVA: diva2:241339
QC 201008182009-10-022009-10-022012-04-04Bibliographically approved