Lower Vertical Frequency Limit for Simply Supported Box-Girder on Moscow-Kazan High-Speed Railway Line
SONG Xiaodong1,2, QIU Xiaowei1, LI Xiaozhen1, LIU Dejun1, GUO Jianxun2
1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China; 2. China Railway Eryuan Engineering Group Co. Ltd., Chengdu 610031, China
Abstract：To study the lower vertical basic frequency limit of a simply supported box-girder on the Moscow-Kazan high-speed railway line，firstly，the vertical fundamental frequency of the prestressed concrete (PC) simply supported box-girder was calculated with theoretical formula. Then，according to the principle of the bridge dynamic effect under the action of a moving train should not surpass that of the designed value，the allowable impact factor of the girder was determined by utilizing the finite element method. Secondly，based on the moving load model，the dynamic simulation analysis was conducted to obtain the impact factor of the simply supported box-girder under a moving train. Finally，the lower vertical basic frequency limits of the PC simply supported box-girder for design speeds of 250，300，350 km/h，and 400 km/h were recommended. The results show that the peak of the dynamic response amplitude of the girder will appear at the first bend natural frequency. Adjusting the vertical basic frequency of the bridge can effectively reduce the vibration peak，which compensates for the vertical excitation frequency caused by the moving train. The lower vertical basic frequency limits of the 33.1 m span PC simply supported box-girder for design speeds of 250，300，350 km/h，and 400 km/h are recommended as 3.02，3.63，4.08 Hz，and 4.68 Hz，respectively.
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