Rail irregularity is the leading cause of enhancing train-track coupling vibration and, therefore, should be studied in detail for\nsafety requirements. In this study, the differences between existing rail irregularities without being subjected to an earthquake\nbetween different countries were first studied. Results show that existing power spectrum density and time-domain displacement\nsamples of rail irregularities in the American code are the largest, while the irregularities of the Germany railway are higher than\nthose of China in a specific range of rail wavelengths. Afterward, the effects of earthquake intensity, soil site, and duration on the\nrail irregularity of a Chinese typical high-speed railway bridge were investigated. For this purpose, a finite element model was\nestablished and validated by the shaking table test of a 1/12-scaled high-speed railway bridge experimental specimen. The\ncalculation results indicated that the influences of earthquakes on the rail alignment irregularity were evident.
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