Numerical analysis of concrete tub at-grade crossing rail structure

This study investigates the stresses developed at the rail transition adjacent to concrete tub crossings at varying train speeds. A finite element analysis (FEA) model was developed and validated with field data acquired from a concrete tub at-grade crossing located in Wyoming, USA. In addition to train speed, the model evaluates the influence and contributions of ties, ballast, and base materials beneath the rail structure used to provide support. The results show the train's speed does not have a critical effect on the rail's stress levels. However, the condition of the ballast adjacent to the concrete tub influences the behavior of the rail. Rail structures supported by ballast with relatively low modulus or displaced materials are subject to increases of stress up to 65 %, due to larger deflections in the supporting materials.