摘要
利用有限元法和现场试验对城市高架箱梁结构的振动特性进行分析,重点研究对桥梁结构辐射噪声具有重要影响的20~200 Hz箱梁振动特性和分布规律。研究结果表明:列车荷载作用下箱梁结构的振动主要集中于40~200 Hz频率范围内,影响箱梁振动的主要为波长0.075~0.375 m的轮轨短波不平顺。轮轨短波不平顺引起的箱梁振动主要集中在50 Hz以上,以箱梁局部振动为主要表现形式。箱梁结构顶板、翼缘和梁底中心的振动水平为100~125 dB;其中顶板和翼板振动的主要形式是垂向振动,腹板和底板的振动分布相对均匀,横向振动与垂向振动同处一个水平。
In this paper by using of FEM and on-site experiments the vibration characteristics of the elevated box girders in urban mass transit subjected to the train were analyzed.The analysis focused on the box girder vibration and distribution characteristics ranging 20~200 Hz that will produce important impact on box girder radiating structure-borne noise.The research results show that under the dynamical train load,the vibration of the box girder is mainly concentrated in the frequency range of 20~200 Hz and the wheel-rail short-wave irregularties with a wavelength of 0.075~0.375 m mainly affect the vibration of the box girder.The vibration of box girder induced by wheel-rail short-wavelength irregularity mainly distributes above 50 Hz with local vibration of box girder as the main form.The vibration levels of the roof,flange and baseboard center of the box girder range from 100 dB to 125 dB.The main forms of the roof and flange vibrations are vertical vibrations.The vibration distribution of the web and baseboard is relatively uniform,with the vertical and horizontal vibrations being at the same level.
作者
房建
韦智敏
郑稳稳
雷晓燕
练松良
刘林芽
FANG Jian;WEI Zhimin;ZHENG Wenwen;LEI Xiaoyan;LIAN Songliang;LIU Linya(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China;MOE Engineering Research Center of Railway Environment Vibration and Noise,East China Jiaotong University,Nanchang 330013,China;Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2022年第4期136-142,共7页
Journal of the China Railway Society
基金
国家自然科学基金(51668019)
江西省教育厅科学技术研究项目(GJJ180297)。
关键词
高架轨道交通
箱梁
振动特性
数值计算
现场试验
elevated urban mass transit
box girders
vibration characteristics
numeric analysis
field test
