基于随机振动响应互相关函数的结构损伤识别试验分析
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摘要
提出了基于结构振动响应互相关函数分析的损伤识别方法。通过八层剪切型钢框架结构模型在模拟白噪声随机激励作用下的试验,利用相邻测点响应的互相关函数幅值向量变化,构造损伤识别因子进行结构损伤判定、定位及程度量化,结果表明该方法对结构损伤识别的简易性及有效性,并为结构在线监测和分散式检测提供方法参考。
A structural damage identification technique based on correlation function analysis of vibration measurement data was proposed.An 8-storey steel shear building model was chosen as example in the case verification.The results demonstrate that accident magnitude change of correlation function can be used to locate the damage by comparing the shape changes between damaged and undamaged samples.The value of CVAC is effective to determinate whether the damage has happened or not,and it can be used as a reference method even for on-line structural health monitoring.The parameter K,defined to detect damage severity,corresponds to the theoretical damage level in different cases.
A structural damage identification technique based on correlation function analysis of vibration measurement data was proposed.An 8-storey steel shear building model was chosen as example in the case verification.The results demonstrate that accident magnitude change of correlation function can be used to locate the damage by comparing the shape changes between damaged and undamaged samples.The value of CVAC is effective to determinate whether the damage has happened or not,and it can be used as a reference method even for on-line structural health monitoring.The parameter K,defined to detect damage severity,corresponds to the theoretical damage level in different cases.
引文
[1]宗周红,任伟新,阮毅.土木工程结构损伤诊断研究进展[J].土木工程学报,2003,36(5):105-110.
[2]Ren W X,Zong Z H.Output only modal parameteridentification of civil engineering structures[J].InternationalJournal of Structural Engineering and Mechanics,2004,17(3-4):429-44.
[3]庄表中,陈乃立.随机振动的理论及实例分析[M].地震出版社,1985.
[4]JamesIII G H,Came T G,Lauffer J P.The natural excitationtechnique(NExT)for modal parameter extraction from operatingstructures[J].Modal Analysis:The International Journal ofAnalytical and Experimental Modal Analysis,1995,10(4):260-277.
[5]于哲峰,杨智春.基于互相关函数幅值向量的结构损伤定位方法研究[J].振动与冲击,2006,25(3):77-80,120.
[6]于哲峰,杨智春.飞机壁板紧固件松脱损伤检测的实验研究[J].应用力学学报,2008,25(1):99-102.
[7]杨智春,党晓娟,谭光辉.基于互相关函数幅值向量和小波变换的复合材料结构损伤检测[J].振动与冲击,2008,27(11):17-21.
[8]王乐,杨智春,王慧,等.白噪声激励下的复合材料层合结构损伤检测的内积向量法[J].振动与冲击,2009,28(4):127-131.
[9]Lei J Y,Yao Q F,Lei Y.Damage identification method basedon correlation function of structural responses to operationalexcitation[A].//Proceedings of international conference onhealth monitoring of structure,material and environment[C].Nanjing,2007.
[2]Ren W X,Zong Z H.Output only modal parameteridentification of civil engineering structures[J].InternationalJournal of Structural Engineering and Mechanics,2004,17(3-4):429-44.
[3]庄表中,陈乃立.随机振动的理论及实例分析[M].地震出版社,1985.
[4]JamesIII G H,Came T G,Lauffer J P.The natural excitationtechnique(NExT)for modal parameter extraction from operatingstructures[J].Modal Analysis:The International Journal ofAnalytical and Experimental Modal Analysis,1995,10(4):260-277.
[5]于哲峰,杨智春.基于互相关函数幅值向量的结构损伤定位方法研究[J].振动与冲击,2006,25(3):77-80,120.
[6]于哲峰,杨智春.飞机壁板紧固件松脱损伤检测的实验研究[J].应用力学学报,2008,25(1):99-102.
[7]杨智春,党晓娟,谭光辉.基于互相关函数幅值向量和小波变换的复合材料结构损伤检测[J].振动与冲击,2008,27(11):17-21.
[8]王乐,杨智春,王慧,等.白噪声激励下的复合材料层合结构损伤检测的内积向量法[J].振动与冲击,2009,28(4):127-131.
[9]Lei J Y,Yao Q F,Lei Y.Damage identification method basedon correlation function of structural responses to operationalexcitation[A].//Proceedings of international conference onhealth monitoring of structure,material and environment[C].Nanjing,2007.
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