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When a ballast track of a high-speed train is constructed on a bridge, the displacement of the bridge deckscan occur because they are not fixed to the rails. Moreover, relative displacements occur between the bridge and railscaused by temperature changes and external loads. The current longitudinal resistance criteria (UIC Code 774-3, KRC-08080) on ballast tracks with continuous welded rails (CWRs) do not take into account the longitudinal movement of the bridge and the frictional force between the ballast and slabs. In addition, the magnitude of the longitudinalresistance, k, is calculated somewhat conservatively and, (therefore?) it acts as an unfavorable element in the design of long span and continuous railway bridges. Thus, in order to replicate the actual behavior more effectively, the longitudinal resistance of CWRs should take into account the additional rigidity between the slab and track. In this study, the longitudinal resistances of the ballasted track on the bridge were analyzed by carrying out an experimentalstudy with a test setup designed to simulate the deck and bed track. In the test results, the maximum longitudinalresistances of the tests were similar to the resistances of the current codes, however, the measured longitudinal stiffness designed to limit the displacement of the tests were much smaller in comparison with the longitudinal stiffness on the codes.

An Experimental Study for Longitudinal Resistance of Ballast Track on Bridge