摘要
涡激振动是斜拉索典型异常振动之一。为实现斜拉索涡激振动的自动识别并摸清涡激振动的振动特征,以一座斜拉桥的12根斜拉索在1个月内的监测数据为基础,分析斜拉索涡激振动特征及其与环境的相关性,并基于涡激振动空间分布特征讨论斜拉索约服役状态。首先,采用斜拉索涡激振动自动识别方法识别斜拉索的随机振动、涡振形成、涡振稳定等3种振动状态;然后,基于识别结果,分析斜拉索涡激振动与风速、风向的相关性以及涡激振动的振幅特征,并讨论涡振自动识别中特征指标的有效性;最后,对比了12根斜拉索涡激振动的出现次数和振幅的空间分布特征,并基于空间分布特征的差异对12根斜拉索可能存在的性能差异进行了讨论。结果表明,涡激振动与风速、风向具有较强相关性,但是特定风向下的特定风速并不一定引发斜拉索涡激振动;斜拉索涡激振动的振幅分布范围较广,小振幅涡激振动与大振幅涡激振动同时存在;采用特定风速风向结合振幅指标并不能准确识别斜拉索涡激振动;背景斜拉桥对称位置的斜拉索涡激振动空间分布特征不同,表明对称位置斜拉索(阻尼系统)服役状态不同。分析结果可为斜拉索监测及养护提供参考。
Vortex-induced vibration(VIV)is one of the typical abnormal vibrations of stay cables.In order to explore the characteristics of vortex-induced vibration of stay cables,the monitoring data of 12 stay cables of a cable-stayed bridge for one month are analyzed.The correlation between VIV and environmental factors are analyzed,and the characteristics of service status of stay cables are discussed through the spatio-temporal distribution characteristics of vortex-induced vibration.Firstly,an automatic identification method for VIV of stay cables is used to identify three vibration status,which are random vibration,forming of VIV and stable VIV.Then,the correlation between VIV of stay cables and wind speed and wind direction are analyzed,and the evolution of vibration amplitude of VIV are also analyzed.Finally,the spatio-temporal distribution characteristics of VIV of 12stay cables are compared,and the possible condition evaluation of 12stay cables are presented based on the statistical results.The results show that VIV has a strong correlation with wind speed and direction,but the wind with specific speed and direction does not certainly lead to VIV of stay cables.The amplitude distribution of VIV of stay cables is wide,and small amplitude VIV and large amplitude VIV are both observed.Using indices such as specific wind speed,wind direction and root mean square of acceleration do not lead to correct identification results.The spatiotemporal distribution characteristics of VIV of cables in symmetric locations of the analyzed bridge are different,which indicates that the service condition of the stay cables(damping systems)in symmetric locations are different.The analysis results provide a reference for monitoring and maintenance of stay cables.
作者
李晓
张斌
贺敏
王帅
王晓光
LI Xiao;ZHANG Bin;HE Min;WANG Shuai;WANG Xiao-guang(Shaanxi Provincial Transport Planning Design and Research Institute Co.Ltd.,Xi'an 710065,China;School of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710064,China;CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China)
出处
《公路》
北大核心
2024年第5期134-141,共8页
Highway
基金
陕西省科技厅重点研发计划项目,项目编号2023-YBGY-140
陕西省科协企业创新争先青年人才托举计划项目,项目编号XXJS202228。
关键词
桥梁工程
斜拉索
涡激振动
自动识别
相关性
服役状态分析
bridge engineering
stay cables
vortex induced vibration
automatic identification
correlation analysis
service condition analysis
