摘要
为研究玉山桥转体施工过程中桥梁的振动状态,以桥梁最大悬臂状态为研究对象,在桥面关键位置布设加速度传感器监测列车通过时转体桥梁的动力响应。首先,采用基线校正方法消除了加速度测量数据的基线漂移和误差,结合随机子空间法和稳定图法识别了转体桥梁的模态信息。其次,分析了客运列车和货运列车在不同车速下诱发振动对转体桥梁加速度动力响应的影响规律,并以客运列车车速110 km/h工况为例,分析了桥梁悬臂状态下加速度能量的分布规律。最后,研究了不同车速诱发的转体桥梁加速度反应谱衰减规律。结果表明:基线校正方法可有效消除测量数据的基线漂移,玉山桥最大悬臂状态下前五阶自振频率分别为1.01,1.57,2.19,3.75,4.47 Hz;桥面3个方向的加速度响应峰值与客运和货运列车行驶速度均存在正相关关系,其中列车诱发振动对转体桥梁竖向加速度影响最为明显;同一车速下,转体桥梁悬臂两端加速度能量谱的频率分布范围较转体结构上承台更广且能量更大,转体桥梁悬臂两端应重点监控;转体桥梁加速度反应谱衰减周期在0.3 s左右,转体桥梁加速度反应谱衰减速度与列车行驶速度存在正相关关系。研究结果可为不中断列车通行实施类似桥梁转体提供技术参考。
In order to investigate the vibration state of Yushan Bridge during swivel construction,taking the maximum cantilever state of the bridge as the study object,the dynamic responses of the swivel bridge during trains passing are monitored by setting acceleration sensors at critical locations on the bridge deck.First,the baseline drifts and errors of the measured acceleration data are eliminated by using the baseline correction method,and the modal information of the swivel bridge is identified by using the stochastic subspace method and stabilization diagram method.Second,the influence rules of vibration induced by passenger and freight trains at different speeds on the acceleration dynamic responses of the swivel bridge are analyzed,and taking the operating condition of the passenger train with 110 km/h speed for example,the acceleration energy distribution at the bridge cantilever state is analyzed.Finally,the attenuation rules of acceleration response spectrum of the swivel bridge induced by different speeds are studied.The result shows that(1)the baseline drift of the measured data can be eliminated effectively by the baseline correction method,and the first 5 natural frequencies at the maximum cantilever state of Yushan Bridge are 1.01,1.57,2.19,3.75,4.47 Hz respectively;(2)the peak values of acceleration response in the 3 directions of the bridge are positively correlated with the running speeds of passenger and freight trains,among them,the vibrations induced by trains have the most significant influences on the vertical acceleration of the swivel bridge;(3)the frequency distribution range of the acceleration energy spectra at the both cantilever ends of the swivel bridge is wider and the energy is greater than those of the upper platform under the same vehicle speed,and the both cantilever ends of the swivel bridge should be key monitored;(4)the attenuation period of the acceleration response spectrum of the swivel bridge is approximately 0.3 s,and there is a positive correlation between the attenuation rate of the acceleration response spectrum and the train running speed.The study result can provide technical reference for implementing similar bridge swivel without interrupting train traffic.
作者
邹华
徐晓松
詹刚毅
卢华喜
杨贤亮
ZOU Hua;XU Xiao-song;ZHAN Gang-yi;LU Hua-xi;YANG Xian-liang(China Railway 24th Bureau Group Southwest Construction Co.,Ltd.,Chengdu Sichuan 610052,China;Jiangxi Ganrong Local Railway Development and Construction Co.,Ltd.,Nanchang Jiangxi 330001,China;China Railway Shanghai Design Institute Group Co.,Ltd.,Shanghai 200070,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang Jiangxi 330013,China)
出处
《公路交通科技》
CSCD
北大核心
2023年第7期94-101,共8页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51868022)
江西省教育厅科学技术研究项目(GJJ180300)。
关键词
桥梁工程
动力特性
实桥测试
转体桥梁
时程分析
bridge engineering
dynamic characteristic
real bridge test
swivel bridge
time-history analysis
作者简介
邹华(1972-),男,江西新余人,高级工程师.(594299526@qq.com);通讯作者:詹刚毅(1984-),男,四川资阳人,高级工程师(185189208qq.com)。
