基于监测数据的斜拉索模态参数变异性分析  被引量:5

Modal Parameter Variance Analysis of Stay Cable Based on Monitoring Data

在线阅读下载全文

作  者:周海俊[1] 刘俊辉 杨夏[1] 李婧超 张超东 孙利民[4] ZHOU Haijun;LIU Junhui;YANG Xia;LI Jingchao;ZHANG Chaodong;SUN Limin(Institute of Urban Smart Transportation&Safety Maintenance,Shenzhen University,Shenzhen 518060,China;Shenzhen Water Group Co,Ltd,Shenzhen 518060,China;College of Mathematics and Statistics,Shenzhen University,Shenzhen 518060,China;State Key Laboratory for Disaster Reduction in Civil Engineering(Tongji University),Shanghai 200092,China)

机构地区:[1]深圳大学城市智慧交通与安全运维研究院,广东深圳518060 [2]深圳市水务(集团)有限公司,广东深圳518060 [3]深圳大学数学与统计学院,广东深圳518060 [4]土木工程防灾国家重点实验室(同济大学),上海200092

出  处:《湖南大学学报(自然科学版)》2022年第5期55-63,共9页Journal of Hunan University:Natural Sciences

基  金:国家自然科学基金资助项目(U2005216,51778372);广东省科技厅项目(2020A0505100065);深圳市海上基础设施安全与监测重点实验室项目(ZDSYS20201020162400001);深圳市基础研究计划项目(CYJ20170818102511790)。

摘  要:基于某大跨斜拉桥5根拉索1年的加速度和温度监测数据,系统分析了在良好天气和暴雨天气下拉索模态参数和索力的变化特征.使用快速傅里叶变换和随机子空间法识别模态频率和阻尼比.对比发现,暴雨天气下拉索振幅大,低阶模态的振动明显,模态阻尼比在两种天气下有一定的差异性.使用频率法计算得到了各拉索连续一年的索力值,其为非平稳时间序列,且具有年和日周期性的波动.索力-索温关系分析表明,各拉索索力-索温的关系各不同,同一根拉索在不同温度范围内的索力-索温关系也可能存在很大的差异.使用半功率带宽法计算得到了各拉索连续一年的阻尼比,得到了自相关函数和其自功率谱,并拟合得到了阻尼比的边缘概率密度分布函数.分析表明,各拉索阻尼比具有时长为1 d、12 h、6 h的周期成分,其边缘概率密度函数可用Burr分布描述.拉索的阻尼比受环境温度的影响较小,受车辆荷载的影响较大.The time-varying characteristics of cable modal parameters and cable tensions under good weather and heavy rain are systematically analyzed based on the one-year acceleration and temperature monitoring data of five cables on a long-span cable-stayed bridge.The modal frequency and damping ratio are derived using the fast Fourier transform(FFT)and stochastic random identification(SSI)method.It is found that the cable vibrates greatly under wind and rain conditions.The low-order mode dominates the vibration,and the modal damping ratio has certain differences in the two circumstances.The tension force of each cable throughout the year,derived using the frequency method,is a non-stationary time series and has annual and daily periodic fluctuations.The correlation analysis of the cable tension and temperature shows that the correlation between the two of each cable is different,even differs on the same cable in different temperature ranges.The half-power bandwidth method is used to calculate the damping ratio of each cable for one year,the autocorrelation function and its self-power spectrum are obtained,and the edge probability density distribution function of the damping ratio is also obtained by fitting.The analysis shows that the damping ratio of each cable has the periodic components of 1 day,12 hours,and 6 hours,and its edge probability density function can be described by Burr distribution.The damping ratio of the cable is less affected by the ambient temperature but more by the vehicle load.

关 键 词:拉索振动 监测数据 模态参数 索力 温度效应 变异性分析 

分 类 号:U448.27[建筑科学—桥梁与隧道工程] U448.14[交通运输工程—道路与铁道工程]

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象