基于小波多分辨力的光纤应变监测信号的多尺度分析研究
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摘要
针对大型工程结构健康监测信号分析过程中的信号交叉问题,以江阴大桥健康监测系统光纤监测信号为对象,通过小波多层分解与逐层重构得到不同尺度上的信号分量,然后进行不同尺度下的信号相关性分析,研究温度作用对于钢箱梁结构应变的影响规律。研究结果表明:大跨桥梁钢箱梁应变信号中的低频部分主要由温度作用造成;夏天的温度作用对钢箱梁局部应变的影响更加显著;同一截面不同位置的测点以及每天不同时段,温度对应变的影响均相差很大。
Aiming at the problem of signal intersections in the signal analysis of structural health monitoring,this paper studies the fiber optic monitoring signal of the health monitoring system for the Jiangyin Bridge.The signal components of different scales are obtained through multilayer wavelet decomposition and layer-by-layer reconstruction.Then the temperature effect on the strain of steel box girder is studied by analyzing the correlation of signals under different scales.The result shows that the low-frequency part in the strain signal of the long-span bridge's steel box girder is mainly caused by the temperature effect.And in summer the temperature effect is more significant on the local strain of steel box girder.The temperature effect on strain differs significantly at different times of a day and at different locations of the same section.
Aiming at the problem of signal intersections in the signal analysis of structural health monitoring,this paper studies the fiber optic monitoring signal of the health monitoring system for the Jiangyin Bridge.The signal components of different scales are obtained through multilayer wavelet decomposition and layer-by-layer reconstruction.Then the temperature effect on the strain of steel box girder is studied by analyzing the correlation of signals under different scales.The result shows that the low-frequency part in the strain signal of the long-span bridge's steel box girder is mainly caused by the temperature effect.And in summer the temperature effect is more significant on the local strain of steel box girder.The temperature effect on strain differs significantly at different times of a day and at different locations of the same section.
引文
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[2]Tong M,Tham L G,Au F T K,et al.Numerical modelling for temperature distribution in steel bridges[J].Computers and??Structures,2001,79(6):583-593.
[3]Mirambell E,Aguado A.Temperature and Stress Distributions in Concrete Box Girder Bridges[J].Journal of Structural Engineering,1990,116(9):2388-2409.
[4]Lueas J M,Virlogeux M,Louis C.Temperature in the Box Girder of the Normandy Bridge[J].Structural Engineering International,2005,15(3):156-165.
[5]JTGD60-2004公路桥涵设计通用规范[S].北京:人民交通出版社,2004.
[6]BS5400.Code of practice for Design of Concrete Bridges[S].British Standard Institute,1984.
[7]Liang Z B,Zhang J,Cao J Q,et al.Separating temperature effect from state monitoring of concrete bridges[C]//Health Monitoring of Structural and Biological System 2009.San Diego:2009:(72952N-1)-(72952N-9).
[8]吴佰建,李兆霞,王滢,等.桥梁结构动态应变监测信息的分离与提取[J].东南大学学报:自然科学版,2008,38(5):767-773.
[9]王滢,李兆霞,吴佰建.润扬悬索桥钢箱梁结构疲劳应力监测及其分析[J].东南大学学报:自然科学版,2007,37(2):280-286.
[10]Sun Zhi,CHANG C C.Structural damage assessment based on wavelet packet transform[J].Journal of Structural Engineering,2002,128(10):1354-1361.
[11]Hou Z,NOORIM,R.St.AMAND.Wavelet-based approach for structural damage detection[J].Journal of engineering mechanics,ASCE,2000,126(7):677-683.
[12]郭健,孙炳楠.基于小波变换的桥梁健康监测多尺度分析[J].浙江大学学报:工学版,2005,39(1):114-118.
[13]李英,张淑贞,许康生.小波降噪方法在地震信号处理中的应用[J].西北地震学报,2006,28(2):159-162.
[14]郭亚,应怀樵,陈剑.小波在应变测试中的应用[J].振动与冲击,2004,23(2):75-77.
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