Ballasted tracks are common in the railway system as a means of providing necessary support for sleepers and rails. To keep them operational, tamping other maintenance actions performed based on track geometry measurements. Ballast particle rearrangement, which is caused by train load, one most important factors leading to degradation. As result, when planning maintenance, it vital predict beha...

To enhance the stability of continuous welded rail (CWR) tracks, frictional sleepers have been developed. The are new types with grooves on bottom, and different bottom improve lateral resistances at magnitudes. In this study, single sleeper push test (SSPT) its model discrete element method (DEM) were carried out to confirm how much arrowhead groove (AGF) increases resistance ballasted track. ...

This paper presents an experimental study on circular stirrup-confined concrete specimens under uniaxial and monotonic load. The effects of stirrup volume ratio, stirrup yield strength and concrete strength on damage evolution of stirrup-confined concrete were investigated. The experimental results showed that the strength and ductility of concrete are improved by appropriate arrangement of the...

the track stiffness experienced by a train will vary along the track. sometimes the stiffness variation may be very large within a short distance. one example is when an unsupported sleeper is hanging in the rail. track stiffness is then, locally at that sleeper, very low. at insulated joints the bending stiffness of the rail has a discontinuity implying a discontinuity also of the track stiffn...

Abstract A new time-delayed periodic boundary condition (PBC) has been proposed for discrete element modelling (DEM) of structures subject to moving loads such as railway track based on a box test which is normally used an testing model. The PBC approached by predicting forces acting ghost particles with the consideration different loading phases adjacent sleepers whereas normal simply gives sa...

investigations on vibration behaviors of railway track systems were attempted in this research. this was made by conducting a comprehensive field investigation into the free vibration of track systems and response of tracks to train moving loads. in-situ modal analysis was used in a railway track field as an efficient method of investigating dynamic properties of railway track systems. natural ...

Prestressed concrete sleeper is a safety-critical track component widely used in ballasted railway tracks. The performance, endurance and quality of prestressed sleepers can detrimentally affect the serviceability durability track. An optimal production method an important criterion underpinning over entire service life sleepers. At present, research work mainly focuses on dynamic load, bearing...