Analysis of Railway Track Stiffness Variation and Its Influence
| dc.contributor.advisor | Mequanent, Mulugeta (Mr.) | |
| dc.contributor.author | Abreham, Demissie | |
| dc.date.accessioned | 2019-01-01T08:16:15Z | |
| dc.date.accessioned | 2023-11-04T15:17:04Z | |
| dc.date.available | 2019-01-01T08:16:15Z | |
| dc.date.available | 2023-11-04T15:17:04Z | |
| dc.date.issued | 2015-10 | |
| dc.description.abstract | Railway track stiffness is a basic parameter of track design which influences the bearing capacity and the dynamic behavior of passing vehicles. In particular, track geometry quality and the life of track components. The stiffness definition must include inelastic and non-linear behavior of the supper structure and substructure elements as well as the existence of the stiffness under dynamic load. In most case track stiffness is a function of track superstructure and substructure material properties. In this paper the influence of track component stiffness variation by using time and frequency domain of FEM (ABAQUS software) analyzed and discussed on the results observed. The Modeling analysis of track stiffness variation depends on the track component (rail-pads, sleeper, ballast and subgrade) stiffness variation and the Results for each track component stiffness variations. Interactive forces, track component displacements, Velocities and acceleration were presented. The analysis consider the influence of rail-pad stiffness, ballast stiffness, sleeper spacing, train speed and subgrade material on track structures. During operation and moving of the freight trains falling of small particles over the ballast layer causes an increase of stiffness in the layer of ballast and gradual deterioration of ballast effect on size of ballast grade and forming powder due to friction exists between stones rubbing together, which reduce the stiffness of ballast. Using the software ABAQUS found that, decrease in sleeper spacing and increases in ballast young’s modulus, ballast depth, sub grade young’s modulus and rail moment of inertia increases the track stiffness at all. In general, relatively high track stiffness is beneficial as it provides sufficient track resistance to applied loads and results in decreased track deflection, which reduces track deterioration. On the other hand, very high track stiffness leads to increased dynamic forces in the wheel rail interfaces as well as on the sleepers and ballast which can cause wear and fatigue of track components. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/15419 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | AAU | en_US |
| dc.subject | Vertical track stiffness | en_US |
| dc.subject | Rail bending stress | en_US |
| dc.subject | dynamic explicit | en_US |
| dc.subject | acceleration | en_US |
| dc.subject | sinusoidal load | en_US |
| dc.subject | stress | en_US |
| dc.subject | BOEF (Beam on Elastic Foundation) | en_US |
| dc.title | Analysis of Railway Track Stiffness Variation and Its Influence | en_US |
| dc.type | Thesis | en_US |