Evaluation of 3D dynamic effects induced by high-speed trains on double-track slab bridges
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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
Dynamics, Frequency analysis, 3D model, Torsional modes of vibration
IdentifiersURN: urn:nbn:se:kth:diva-188850OAI: oai:DiVA.org:kth-188850DiVA: diva2:939858
Subject / course
Structural Design and Bridges
Degree of Master - Civil and Architectural Engineering
Andersson, Andreas, Tekn drÜlker-Kaustell, Mahir, Tekn dr
Karoumi, Raid, Prof