Analysis of Temperature-induced Deformation of Reinforced Track Slabs under the Influence of Multiple Factors

The temperature deformation and damage of CRTS II slab track reinforced by post-installed anchors are affected by many factors, such as the state of concrete joints, and the bonding state between post-installed anchors and concrete of the track.Considering the non-linear characteristics of the mechanical properties of the concrete material, the interfacial behaviour, and the mechanical performance of the anchoring system, a finite element model of the reinforced CRTS II slab track is established to analyze the influence of multiple factors on the temperature deformation and damage behaviour of the reinforced CRTS II slab track.The results show that the main wave wavelength of the up-arching of the track slabs under temperature rise loading is smaller than the auxiliary wave wavelength, and the post-installed anchors do not significantly change the wavelengths of the main wave and the auxiliary wave.It is possible to make the longitudinal middle position of track slabs arch when anchoring reinforcement is implemented.Compared with the bonding state of anchoring reinforcement, the degree of damage of concrete joints has a greater impact on the temperature-induced deformation of the track after reinforcement.Considering the deformation of the track-slab arch, longitudinal displacement, and interlayer damage, it is recommended to repair the lower part of the concrete joints with a damage height of more than 50% of its total height in time.