On behalf of the engineering consortium ILF/Geodata/HBI we performed a detailled fatigue analysis of the air pressure stress imposed on cross-cut doors by trains running through the Brenner Base Tunnel.

High-resolution 1D computational fluid dynamics (CFD) algorithms have been used to simulate the 24 hour air pressure load history emerging at 10 selected observation points. These results have been aggregated for the estimated 200-year life span of the tunnel using the Rainflow Method to form a resulting fatigue damage spectrum.

Furthermore, an FFT analysis has proved that no distinctive oscillation stress is to be expected from the air pressure loads.

Our consolidated findings allow BBT-SE (the key account) to reduce fatigue assessment specifications for cross-cut doors and similar construction elements, providing considerable cost savings in comparison with traditional specifications.

Wolfgang Glas, 05 Feb 2013

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