研究目的: 高速铁路列车速度是衡量国家铁路发展水平的重要指标之一,时速400 km是目前多个国家追求的目标或发展方向。中国国家铁路集团有限公司于2021年组织实施“CR450科技创新工程”。本文基于京沪高速铁路32 m简支箱梁在动车组420 km/h速度范围内的试验数据,从桥梁结构自振频率、竖向刚度、动车组作用下的动力响应方面分析其对动车组400 km/h运行的适应性。
研究结论: (1)32 m简支箱梁梁体竖向自振频率实测值为6.68~7.03 Hz,大于相关文献按440 km/h仿真计算确定的基频限值5.1 Hz;(2)32 m简支箱梁梁体竖向刚度能够保证动车组400 km/h运行的安全性和乘坐舒适性;(3)32 m简支箱梁结构承载力满足动车组400 km/h的运营荷载要求;(4)32 m简支箱梁实测梁体竖向振动加速度最大值为0.27 m/s2,小于《高速铁路设计规范》规定的限值5.0 m/s2;(5)在动车组420 km/h速度范围内,正线轮轴横向力实测值一般小于20 kN,实测梁体跨中和桥墩墩顶横向振幅数值均较小,实测无砟轨道相邻梁端两侧的钢轨支点横向相对位移小于《高速铁路设计规范》规定的限值1 mm,350 km/h高速铁路32 m简支箱梁竖向、横向刚度能够保证动车组400 km/h运行的安全性和乘坐舒适性;(6)本研究成果可为350 km/h高速铁路32 m简支箱梁提速至400 km/h提供技术支撑。
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.
关键词
高速铁路 /
32 m简支箱梁 /
提速 /
试验 /
适应性
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Key words
high speed railway /
32 m simply supported box beam /
speed increasing /
experiment /
adaptability
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中图分类号：
U446.1
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参考文献
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脚注
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基金
中国铁道科学研究院集团公司基金项目(2020YJ048)
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