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The dynamic behaviour of a railways viaduct modelled after an actual structure located in Santana do Cartaxo, Portugal, is analysed through a parametric statistical analysis. Most previous work on parametric analyses of railway bridges considered the influence of key parameters individually, leading sometimes to contradictory conclusions. Simultaneous consideration of the influence of several key parameters provides a better representation of reality associated with the application of statistical analysis. In this study the key parameters selected are the train speed and some of the parameters known to contribute to ballast behaviour. Natural frequencies, maxima in displacements and accelerations at mid-point of bridge spans were chosen as key response measures. The load applied corresponds to the locomotive used in the Intercidades train. In the preliminary stages, either one axle load is applied, or two axle loads moving in opposite directions are introduced. Factorial experimentation was selected for the statistical analysis. The viaduct model was developed using the ANSYS/LS-DYNA module. Results are shown and interpreted.

Dynamic Analysis of the Santana do Cartaxo Viaduct: Definition of the Experimental Verification using Statistical Analysis of the Numerical Results