Aerodynamic excitation of noise barrier systems at high-speed rail lines - Fatigue analysis

Design and calculation of noise barrier systems are defined with respect to fatigue due to aerodynamic excitation induced by high speed trains (pressure-suction effect). This paper summarizes the mechanical model of noise barriers and analyses the structural behaviour under dynamic cyclic loading. Due to the significant influence of the trains´ aerodynamic shape, it was subsequently necessary to carry out in-situ measurements for the determination of the aerodynamic impact of different train types like ICE and Railjet. The finite element model encompasses a three dimensional noise barrier with pile foundations. Applying model updating algorithms and modal analysis to determine the natural frequencies and mode shape functions (modal properties) ensures the accuracy and reliability of the expected results from the numerical model. The passages of high speed trains were modelled over time using transient analysis with a synthetic load pattern. The aim of this calculation was to obtain the maximum deformations and stresses at each post over the investigated section.