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

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Insinööritieteiden korkeakoulu | Master's thesis
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Date

2022-10-10

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Major/Subject

Geotechnical Engineering

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Degree programme

Master's Programme in Geoengineering (GEO)

Language

en

Pages

88 + 21

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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.

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Supervisor

Solowski, Wojciech

Thesis advisor

Kulman, Mauri

Keywords

dynamic factor, pseudo-static analysis, dynamic analysis, railway traffic loads, FEM modelling

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https://urn.fi/URN:NBN:fi:aalto-202210165940

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