| With high development of high-speed railway, rail structures require more riding comfort and more stability, ballastless track get rapid development and wide range of application. Slab track is widely used because of its well riding comfort, high stationary and less maintenance. With the speed up of the train, wheel/rail excitations such as wheelset flat, random irregularity of track and turnout can cause severe vibration of vehicle/track system, influence long-term service performance of slab, so research on the life of slab under wheel/rail excitation has great theoretical and practical significance.This dissertation researches the fatigue behavior of CRTS Ⅱ slab track under train loads with the method of combining the multi-body dynamics, finite element method and fatigue theory. This paper gains the vibration performances of main components of the vehicle-track system based on vehicle-track coupling dynamics program with FORTRAN language, and make the main component such as carbody, rail and slab flexible, and analyzes the structure strength of slab through Finite Element Method with ANSYS. Finally, with load spectrum gained in the program, structural strength gained in ANSYS, S-N curve of concrete and rebar and Miner theory to evaluate and forecast fatigue life of slab with nCode software. After the calculation, we can get fatigue life and damage of slab which experienced different load cycle times in different velocities and different excitations, and analyze weak areas of slab and the reason. The research result shows that the exciting slab can basically satisfy the design life requirements.It has certain guiding significance to slab design, construction and daily maintenance. |
PDF Full Text Request