Assessment of the values of dynamic factors based on data from the Kokemäki-Pori railway section

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Journal Title
Journal ISSN
Volume Title
Insinööritieteiden korkeakoulu | Master's thesis
Date
2022-10-10
Department
Major/Subject
Geotechnical Engineering
Mcode
Degree programme
Master's Programme in Geoengineering (GEO)
Language
en
Pages
88 + 21
Series
Abstract
Traditionally, pseudo-static analyses have been used to evaluate the influence of dynamic forces on structures. In this approximation, a static force is amplified by a dynamic factor. Then it is assumed that the effects on the structure due to a pseudo-static load are equivalent to the real effect of a dynamic force. However, pseudo-static approximation may constitute an oversimplification of dynamic problems and result in overdesigning. With the new developments in the numerical methods field, we could more accurately analyse the impact of dynamic loadings using advanced computational tools such as FEM models. In this work, using FEM models, a comparison between pseudo-static and dynamic analysis was done to evaluate the influence of railway traffic on nearby structures. A total of 40 simulations were run corresponding to 10 modelling cases (6 pseudo-static, 4 dynamic) and 4 cross-sections (without structures, pile-supported embankment slabs and retaining walls). The results showed that the pseudo-static approach might be appropriate to assess the influence of railway traffic on nearby structures, with some limitations regarding the estimation of displacements. In other words, it may not be necessary to do a dynamic model to evaluate the effects of traffic loadings on structures.
Description
Supervisor
Solowski, Wojciech
Thesis advisor
Kulman, Mauri
Keywords
dynamic factor, pseudo-static analysis, dynamic analysis, railway traffic loads, FEM modelling
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