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- W828955274 abstract "The theory of Beam on elastic Foundation is generally used for the analysis of track structures in which the rail is supported by a series of continuous linear spring on an elastic foundation. Each individual element of the rail seat is modelled by a spring. The most important aspect of the track analysis is to calculate the loads that are transmitted to the track elements i.e. rails, sleepers, fasteners, ballast etc. It is for that reason that the track modulus should be defined as accurate as possible. Since the track modulus is calculated considering the combined influence of all track elements it is relatively difficult to define by a simple equation The track modulus can be easily changed to account for variation in the sub - ballast condition and using term of the element. The ballast has a large impact on the track modulus that result from variations in the specific gravity, rigidity and hardness of the ballast material. The track modulus can also be influenced by changing weather conditions, for example by repeated freezing and thawing of the ballast and ground. Until now in spite of this approximation of the track modulus it was acceptable to perform the track analysis with an assumed linear track modulus under the applied load. Linear superposition of the individual track components can not predict the actual track reaction for the ballastless track which is generally adopted for subways and for high speed railway track with their increased train speed. This is specially important for subway structures where the track modulus is governed by the rubber boot and the pad on which the concrete sleeper is supported. In order to perform an exact track analysis it is important to consider the non-linear behavior of the various track components. Results of a non-linear track analysis indicate that the bending moment in the rail is smaller and the rail compression is larger than those determined by linear track analysis. These results may have a direct impact on the concrete sleeper design. This paper includes verification of the track reactions determined by non-linear track analysis with those determined by tests on ballastless subway track on the Seoul Metro and those track reactions defermined on the Korean National Railway Kyongbu line which were performed as part of research for the Korean High Speed Rail Project. A comparison of on linear and nonlinear analysis results is also provided." @default.
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- W828955274 date "1996-01-01" @default.
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- W828955274 title "The Analysis of Track Structures with Non-linear Track Modulus Based on Field Measurements" @default.
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