350 km/h高铁32 m简支箱梁提速<br/>至400 km/h适应性分析

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Abstract Research purposes: The train speed of high speed railway is one of the important indicators to measure the development level of national railway and 400 km/h is the goal or development direction pursued by many countries. China Railway has organized the "CR450 Scientific and Technology Innovation Project" in 2021. Based on the test data of 32 m simply supported box beam of Beijing-Shanghai highspeed railway in the speed range of 420 km/h of EMU, the adaptability of 32 m simply supported box beam used in the 350 km/h high speed railway to 400 km/h operation of EMU was done by the analyses of its natural frequency, vertical stiffness and dynamic response under the action of EMU.
Research conclusions: (1)The measured vertical natural frequency of 32 m simply supported box beam is 6.68~7.03 Hz, which is greater than the fundamental frequency limit of 5.1 Hz determined by the relevant literature according to the 440 km/h simulation calculation. (2) The vertical stiffness of the 32 m simply supported box beam can ensure the safety and ride comfort of EMU running at 400 km/h. (3) The structure bearing capacity of the 32 m simply supported box beam meets the operating load requirement of EMU running at 400 km/h. (4) The maximum measured vertical vibration acceleration of 32 m simply supported box beam is 0.27 m/s², which is less than limit value of 5.0 m/s² specified in Code for Design of High Speed Railway. (5) Within the speed range of 420 km/h of the EMU, the measured wheelset lateral force of main line is generally less than 20 kN, the measured values of the lateral amplitude at the midspan of beam and the top of pier are small, and the measured lateral relative displacement of the rail support on both sides of the adjacent beam ends of the ballastless track is less than the limit value of 1 mm specified in Code for Design of High Speed Railway. The vertical and lateral stiffness of 32 m simply supported box beam used in the existing 350 km/h high speed railway can ensure the safety and ride comfort of EMU running at 400 km/h. (6) The research results can provide technical support for raising the speed of 32 m simply supported box beam used in 350 km/h high speed railway to 400 km/h.

Key words： high speed railway 32 m simply supported box beam speed increasing experiment adaptability

Received: 13 August 2021

PACS:

U446.1

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	WANG Wei

Cite this article:

WANG Wei. Analysis of Adaptability of the 32 m Simply-supported Box Beam Used in the 350 km/h High Speed Railway with Speed Increasing to 400 km/h[J]. Journal of Railway Engineering Society, 2022, 39(7): 50-54.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I7/50

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