Influence of Application under sleeper pads and under rail pads on ballasted track behavior in the Transition Zone short span railway bridges

Document Type : Original Article

Authors

1 Msc Railway. Faculty transportation. Isfahan University, Isfahan,

2 Assistant Professor, Faculty of Civil and Transportation, University of Isfahan

3 PhD of Railway Engineering, Iran University of Science and Technology

Abstract

Abrupt changing in track vertical stiffness on railway bridges transition zone, increased dynamic loads and asymmetric deformations. Using elastic pads on the deck such as under sleeper pads and rails reduce the track vertical stiffness on deck. So a finite element model of the ballasted track and short span bridge were created and validated.The results show that at method used under sleeper pads on deck , state use the under sleeper pads with variable stiffness for all sleepers on the deck is the best performance and nearly 20, 5 and 7 percent improvement in behavior in terms of static rail vertical displacement, ballast layer vertical displacement and normal stress in subgrade layer respectively and based on dynamic analysis rail dynamic vertical displacement and rail vertical acceleration improved 9 and 16 percent respectively. About combinatorial transition method include improved embankment in transition zone with resilient pads under the rail for rail on deck improved track behavior based on the criteria the rail vertical displacement and ballasted layer vertical displacement about 31 percent, also decreased the normal stress in the middle of the subgrade layer approximately 24 percent and based on dynamic analysis, rail dynamic vertical displacement and rail vertical acceleration is improved by about 27, 34 percent respectively.

Keywords

References

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