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International Journal of Railway Technology
IJRT, Volume 6, Issue 2, 2017
Validation of a Numerical Model for Dynamic Three-Dimensional Railway Bridge Analysis by Comparison with a Small-Scale Laboratory Model
P. Bucinskas1, J. Sneideris2, L. Agapii2 and L.V. Andersen1
1Department of Engineering, Aarhus University, Aarhus, Denmark
P. Bucinskas, J. Sneideris, L. Agapii, L.V. Andersen, "Validation of a Numerical Model for Dynamic Three-Dimensional Railway Bridge Analysis by Comparison with a Small-Scale Laboratory Model", International Journal of Railway Technology, 6(2), 61-85, 2017. doi:10.4203/ijrt.6.2.4
Keywords: multi-span bridge, dynamics, laboratory test, small-scale model, structure–soil interaction, model validation.
The aim of this paper is to analyse to what extent a small-scale experimental model can be applied in order to develop and validate a numerical model for dynamic analysis of a multi-span railway bridge interacting with the underlying soil. For this purpose a small-scale model of a bridge structure is constructed in the laboratory, and the results are compared with the proposed computational model. The computational analysis employs a multi-degree-of-freedom system for the vehicle, a three-dimensional finite-element model for the bridge structure and a semi-analytical solution for the subsoil, using an iterative coupling procedure for wheel–rail contact. The experimental model of the bridge is made of Plexiglas and mattress foam is used as subsoil. The model is equipped with accelerometers and excited by a vehicle with four axles moving at constant speed on a track across the bridge. The results indicate that the numerical model reproduces the structural response of the experimental model with fair accuracy for a variety of cases regarding the subsoil.
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