الفهرس Only 14 pages are availabe for public view
 |  | from | 110 |  |  |
| | | from | 110 | | |
Abstract
The demands on railway track structures arc increasing year by year due to
more frequent and heavier transport of passengers and goods at higher speeds through more densely populated areas. There are many railway-related structures such as stations, retaining walls, bridges ... etc. Herein we will be concerned with the bridges due to their importance and critical sites. In this context, there is a need for a clear description of track dynamics, however complete dynamic train-track interaction IS essential in the analysis of such track-related structures especially bridges. The dynamic response of railway bridges has been studied before by several researchers as a simply supported beam subjected to moving loads/masses without any interaction between the moving vehicle and bridge considering only the variation of load position. Also, many researchers developed new models for train vehicle considering the dynamic train-track interaction in order to investigate the effect of various dynamic parameters such as vehicle stiffness, bridge stiffness, train speed and rail irregularities. In spite of the importance of the effect of bridge type, Girder/Truss, and structural system, Simple/Continuous, they have not been studied well yet. In this research these effects are studied extensively using an elaborate vehicle model. Also, the effect of model type is studied using two different vehicle models, the first is a simple model that constitutes just 3-DOFs and the second is a complex model that constitutes 2 1¬DOFs. A FORTRAN program has been developed for each model, and verified through several examples, using data reported in previous published researches. Moreover, the formula of Egyptian Railway Code is evaluated from some aspects, and recommendations are reported.