Train‐Induced Concrete Fatigue Damage of CRTS III Slab Ballastless Track

This study explores the fatigue damage of concrete components in the CRTS III slab ballastless track under repeated high‐speed train loading. A stochastic damage‐based computational framework is developed and implemented in a finite element track model to simulate the evolution of concrete fatigue damage over a 100‐year design life. The fatigue damage evolution, corresponding mechanical responses, and fatigue life of the concrete track‐slab, self‐compacting concrete layer, and concrete base are evaluated. The results indicate that tensile fatigue damage initiates in the lower region of the self‐compacting concrete layer, while compressive fatigue damage is confined beneath the rail support platforms of the track‐slab. Despite progressive damage accumulation, structural stress and deformation are only slightly affected. The concentration zones of compressive fatigue damage highlight the track‐slab as the most critical component, with its fatigue life exceeding the 100‐year service period.