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Effects of debonding repairment on interfacial damage and thermal deformation of CRTS II slab ballastless track
Highlights Debonding repairment restores the compatibility of thermal deformation. Re-debonding happens after a one-year cyclic temperature gradient load. Rebars-implanting helps to inhibit the thermal deformation development. Debonding repairment operation requires more effective repair materials.
Abstract The effects of debonding repairment on the interfacial damage and thermal deformation of CRTS II slab ballastless track are further assessed in this work. An improved mixed-mode bilinear cohesive zone model was adopted in an attempt to obtain a more accurate prediction of the interfacial damage. A finite element model of CRTS II slab ballastless track was built with the debonding repairment considered, based on which the interfacial damage and structural deformation of CRTS II slab ballastless track were simulated under the field-measured temperature gradient loads. The results show that the debonding repairment restores the capacity of CRTS II slab ballastless track to resist the thermal deformation, but that capacity will gradually decrease with the accumulation of interfacial damage. The re-debonding in the upper interlayer of CRTS II slab ballastless track, which may happen after a one-year cyclic temperature gradient load, will result in the emergence of an opposite-sided debonding in the lower interlayer. In addition, implementing the debonding repairment with the rebars-implanting has significant impact on reducing the re-debonding height.
Effects of debonding repairment on interfacial damage and thermal deformation of CRTS II slab ballastless track
Highlights Debonding repairment restores the compatibility of thermal deformation. Re-debonding happens after a one-year cyclic temperature gradient load. Rebars-implanting helps to inhibit the thermal deformation development. Debonding repairment operation requires more effective repair materials.
Abstract The effects of debonding repairment on the interfacial damage and thermal deformation of CRTS II slab ballastless track are further assessed in this work. An improved mixed-mode bilinear cohesive zone model was adopted in an attempt to obtain a more accurate prediction of the interfacial damage. A finite element model of CRTS II slab ballastless track was built with the debonding repairment considered, based on which the interfacial damage and structural deformation of CRTS II slab ballastless track were simulated under the field-measured temperature gradient loads. The results show that the debonding repairment restores the capacity of CRTS II slab ballastless track to resist the thermal deformation, but that capacity will gradually decrease with the accumulation of interfacial damage. The re-debonding in the upper interlayer of CRTS II slab ballastless track, which may happen after a one-year cyclic temperature gradient load, will result in the emergence of an opposite-sided debonding in the lower interlayer. In addition, implementing the debonding repairment with the rebars-implanting has significant impact on reducing the re-debonding height.
Effects of debonding repairment on interfacial damage and thermal deformation of CRTS II slab ballastless track
Yan, Daobin (author) / Xu, Yude (author) / Zhu, Wenjun (author)
2023-05-12
Article (Journal)
Electronic Resource
English
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