Study On Damages And The Longitudinal Forces Of Element Slab Ballastless Track

There are many problems and damages on the element slab ballastless track because of loss of systematic study, so it is necessary to study the cause of damage and the force constitution with the factual situation.Connected with the slab track damage state, this thesis established a element slab ballastless track cantilever bumping abutment layed on the soil formation finite element and analysis model using the ANSYS finite element analysis soft. The model is mostly built using the solid element, taking into account the friction and slippage of the slab and CA mortar layer, and so the contact element is adopted to analyse the connection, other contact in this thesis interact with the shared nodes. Steel rail is simplified to bar elements, fastener longitudinal resistance and friction between the base plate and bridge are simulated by nonlinear spring element, fastener longitudinal resistance and friction between the base plate and roadbed are simulated by nonlinear spring element.It is mainly to analyse the longitudinal force of the slab track cantilever bumping abutment, including the calculation of temperature force and braking force.. When the slab track occurs buckling deformation under the temperature force, the force of the track plate and cantilever bumping abutment are related to the elastic modulus of the colophony, so this thesis also analyses the impaction of the track plate and cantilever bumping abutment's force under different elastic modulus of the colophony. Meanwhile this thesis also analyse the force change of the track plate and cantilever bumping abutment when the colophony around the cantilever bumping abutment occurs damage and when the CA mortar layer is not full under all modes.The results show that the track plate and cantilever bumping abutment have a larger force under the temperature load, so it can be used as a predominant factor in its design. Lower elastic modulus of the colophony is beneficial to the track plate and cantilever bumping abutment's force, once the colophony occurs damage, it will be not beneficial to the track plate and cantilever bumping abutment's force, if the CA mortar layer is not full, it will influence the track plate and cantilever bumping abutment's force, although it is not obvious, it will influence the CA mortar layer's force obviously. The changes of the track plate and cantilever bumping abutment's force are not obvious under the braking force, it is possibly due to the friction force between the track plate and the CA mortar layer is bigger. After the colophony around the cantilever bumping abutment has been extrused, the two sides of the cantilever bumping abutment appear stretching stress, it is not beneficial to the cantilever bumping abutment compare to the normal situation.