Analysis On CRTSⅡ Track Slab Temperature Effects And Its Influences On The Running Safety Of The Vehicle

With the rapid development of high-speed railway, non-ballasted slab track as a track structure, has been a wide range of use.The temperature load is an important factor to affect the structural safety with the outside natural conditions for the track structure being much more complex. This thesis mainly studies CRTS II slab track plate deformation and stress under the influence of temperature load, and also studies the deformation of rail casued by the rail plate, and analyses its impact on the security of vehicles running.This thesis briefly reviews and summarizes the history and present situation on the temperature effect of concrete structures both domestic and aboard, conducts the thorough research aiming at the track plate temperature effect. Based on ANSYS finite element anslysis, this thesis establishs the CRTS II slab track plate temperature effects analysis model, studies the track plate deformation and stress under the temperature effect. Based on the vehicle-track coupling dynamics, application numerical simulation method has been used to study the effect on the security for vehicle operation.The validity and perfection degree of the finite element model plays a decisive role in the dependability and accuracy of the simulation result, at the same time affects the efficiency of the computation. Therefore, this thesis first established three bonding slab model, and analyses the length effect of calculation results.The results show that three track plate length model can accurately reflect calculation results with high computational efficiency. In the future simulation, three track plate length model has been adopted.Followed, this thesis establishs two models including a three plates bonding model and a contact model, simulated two connection methods between the track board and the CA mortar. With calculating and analysising two models with imposing the temperature load, we could compare the temperature deformation and stress of them. The numerical results show that with the changing of the temperature, the deformation of the track plate changes linearly. Temperature deformation of the track plate in the contact model was larger than the deformation in the bonding model, but had the less internal stress.Finally, based on the vehicle-track coupling dynamics, this thesis established the vehicle-track plate vertical coupling program, and enetered the rail vertical deformation calculated by the contact model as the rail irregularities into the program. The results showed that, when simply considered the rail irregularities caused by the temperature deformation, the effect to the safety of the vehicles had little influence.