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| Analysis of Periodic Track Irregularities on the Bridges of Chengdu －Dujiangyan Intercity Railway |
| YANG Fei，SONG Guo － hua，LI Guo － qing |
| China Academy of Railway Sciences，Beijing 100081，China |
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Abstract Research purposes: Since the Chengdu － Dujiangyan Intercity Railway was open to traffic，the periodic track irregularities on the bridge have been found by many inspections of the track dynamic profile． In order to dynamically know the impact of the periodic track irregularities on the safety and comfortableness of EMU，this paper analyzes the cause for the irregularities and development law of the irregularities with the statistical methods and dynamics simulation technology．
Research conclusions: The analysis results show that the periodic track irregularities on the bridge may be mainly caused by the concrete ＇s shrinkage and creep or the low stiffness of bridges． In addition，the irregularity of the 32 m －wavelength on the bridges is exactly in the ranges of sensitive wavelength of the trains at the speeds of 160 km / h and 200 km / h． Under the same amplitudes，the maximum vertical acceleration response is got at the speed of 200 km / h and the maximum unloading rate response is acqured at the speed of 160 km / h，and when the amplitude reaches at 7 mm，the vertical acceleration is over 0． 15 g，which exceeds comfortableness index Ⅱ． So it is necessary to treat the track irregularity on the bridge．
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Received: 24 January 2011
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2011, Vol. 28 
