A Validated Train-Track-Bridge Model with Nonlinear Support Conditions at Bridge Approaches

A bridge approach, an essential component connecting a relatively rigid and more flexible track on subgrade soil, is one of the most common types transition zones. The tracks deck often undergo significantly lower deformations under loading compared to approach tracks. Even though there have been numerous efforts understand remediate performance deficiencies emerging from differences in stiffness between issues such as differential settlement unsupported hanging crossties exist. It difficult expensive try different combinations mitigation methods field. Therefore, computational modeling becomes vital importance study dynamic responses railroad approaches. In this study, field instrumentation data were collected substructure US Amtrak’s Northeast Corridor After analyses model implementation comprehensive data, advanced train-track-bridge introduced validated paper. Nonlinear relative displacements varying contact forces observed crosstie ballast are adequately considered model. then used simulate Amtrak passenger train entering open generate typical transient better behavior trends simulated results show that near location experiences much larger deformations, impact forces, vibration velocities accelerations. analysis tool evaluate at approaches with nonlinear support; it intended eventually aid developing improved design maintenance practices.