Study On The Safe Limits Of CWR Railbreak Gaps In The Highway-Bridge

The design of Continuously Welded Rail (CWR) on high-speed railway bridges is the difficult and critical technologies. The mutual additional longitudinal force transmission between CWR and high-speed railway bridges is an important force for high-speed railway bridge. If the force is too great, it may cause the rupture of rail, the running safety of high-speed train is threatened. It is mecessary to research the safe limits of CWR rail break gaps in the high-speed railway bridge, which is quite important in engineering application.Now, the rail break gaps of CWR in the high-speed railway bridge are maded by many norms, but the exact value is still not exists. Because of huge conceptial differences between our country and Europe in the design of CWR on high-speed railway bridges, it seems hard to make a mathematical substantiation or determination, however, of safe limits on the acceptable width of the rail break gap.Avove the study background, a complete research about the safe limits on the acceptable width of the rail break gap is done by this paper, the mainly content and result were listed as follows:1. Based on the finite element analysis software ABAQUS, a static model was established for calculating the safe limits of CWR rail break gaps in the high-speed railway bridge. With this model, we can calculate the different force and deformation of the different rail break gaps caused by mass of the train, also caused by different rail break location.2. Based on the finite element analysis software ABAQUS, a dynamic model was established. It main compute the impact force on broken rail ends due to the different speed and different rail break gaps to run over a given size of gap. To use the test track and train to run over the various size of rail gaps and monitor the behavior of rail and construction of train. Then examine the rail stress and deformation to see if rail can hold the train on the track.3. Some regularities and conclusions refer to the safe size of the rail break gap can be obtained by the analysis of static model and dynamic model. The goal of this research is to determine acceptable safe limits for rail break gap in CWR on high-speed railway bridges which should be 90mm.