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Evaluation of 3D dynamic effects induced by high-speed trains on double-track slab bridges
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In addition to a static design, a dynamic analysis has to be performed for bridges

for which the maximum permissible train speed exceeds 200 km/h. This analysis

requires a lot of computing time, for this reason Svedholm and Andersson (2016)

have developed a simple tool describing the relationship between the first eigenfrequency

of the bridge, the span length and the minimum mass to fulfill the regulation

specified in EN-1990.

However, these diagrams are based on 2D beam models in which the 3D dynamic

effects are not considered. An evaluation of the torsional modes has been performed

by analyzing parametrized 3D bridge models, in order to obtain design diagrams

including these effects.

To do so, a frequency domain analysis has been implemented, based on a steadystate

step previously performed in a FEM software. This approach provides a fast

way to solve the equation of motion due to the Fourier transform properties, and

allows applying several load configurations which are convenient for a parametric


From this analysis it can be concluded that the thickness to fulfill the demands is

larger for 3D models than for 2D. On one hand, contribution of torsional modes of

vibration is more significant for the shortest span length, and on the other hand

shear-lag effects lead to a reduction of the total resisting bending section.

Place, publisher, year, edition, pages
2016. , 172 p.
TRITA-BKN. Bulletin, ISSN 1103-4270 ; 487
Keyword [en]
Dynamics, Frequency analysis, 3D model, Torsional modes of vibration
National Category
Infrastructure Engineering
URN: urn:nbn:se:kth:diva-188850OAI: diva2:939858
Subject / course
Structural Design and Bridges
Educational program
Degree of Master - Civil and Architectural Engineering
Available from: 2016-06-29 Created: 2016-06-20 Last updated: 2016-06-29Bibliographically approved

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