Railway Plate Ballast Track Structure Analysis Method

The ballastless track is a new kind of track structures. At the present time, China has been paying more attention to developing high-speed railway and special line for passenger transport, which can be a precious time for ballastless track's development. However, the design and calculational theory of ballastless track structures is not fully built in China, which can't meet the needs of ballastless track application in high-speed railway and special line for passenger transport. In this paper, ordinary slab track is taken for example, and the analytical methods of ballastless track structures are studied.On the basis of the structural characteristics of slab ballastless track, the composite beam model based on elastic foundation beam theory, the FEM model based on structural system of composite beam and the FEM model based on structural system of combination of beam and slab are established via proper hypothesis. The application of these three models in slab ballastless track is showed according to some calculational examples. The analytical results can be obtained by MATLAB program.The composite beam model based on elastic foundation beam theory, the FEM model based on structural system of composite beam and the FEM model based on structural system of combination of beam and slab are compared and analyzed reciprocally. For the same problem of slab track structures, the calculational results gotten by these three models have few discrepancies, and each of them can satisfy the demand of engineering. It can be seen that traditional composite beam theory is a practical way in analyzing the structures of slab ballastless track. The FEM model based on structural system of composite beam is commended in analysis and calculation of slab ballastless track structures.The structures of ballastless track on bridge are studied, the displacement and internal force of ballastless track on bridge under the loads are calculated by the FEM model based on structural system of composite beam. The caculational results show that the locality of loads' action has important influence on the displacement and internal force of rail and slab, but arrangement form of supports influence bridge more; That loads act on the border of structures, where active supports has been at, is the worst combination for the whole structures, on which should be paid more attention.