Durability analysis of buried pipelines crossing under railway track; High cycle fatigue case(Fe-safe & Abaqus)

The study aims to assess the integrity of buried oil and gas pipelines crossing railroad impacted by moving train. A user subroutine VDLOAD is used to model the wheel load on the multilayered soil structure while railway sleepers were modelled using a high strength concrete. For analysis purpose ABAQUS is used to model the dynamic behavior of the moving train load while Fe-safe which is produce of Dassault system is used to predict the high cycle fatigue by estimating the failure cycles as well reliability of the pipeline structure under different load variance. Different diameters pipelines were arranged at different depth in the soil structure lying perpendicular and parallel to direction of moving load. Results shows that pipeline lying parallel to the direction of the moving load experience more impact and hence fatigue failure at the circumference of the pipeline in expected more severely.