| 基于模态柔度矩阵变化指标的结构损伤预警方法 |
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| 引用本文： | 赵玲,李爱群.基于模态柔度矩阵变化指标的结构损伤预警方法[J].东南大学学报(自然科学版),2009,39(5). |
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| 作者姓名： | 赵玲 李爱群 |
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| 作者单位： | 1. 东南大学土木工程学院,南京,210096;扬州大学建筑科学与工程学院,扬州,225009
2. 东南大学土木工程学院,南京,210096 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 根据结构损伤后其柔度增大的特征,在与实测自由度相应的柔度矩阵基础上,提出了基于模态柔度矩阵变化的损伤预警指标FI 以及运用该指标对实际结构进行损伤预警或异常检测的步骤.损伤预警指标的敏感性分析包括不含噪声和含噪声情况.该指标的损伤报警阈值可依据结构在无损状态时由健康监测系统或定期检测所得到的实测模态数据以及结构有限元模型的模态分析结果计算得到.以润扬长江大桥斜拉桥为背景的数值模拟分析结果显示:无论有无噪声的影响,指标FI 都随着斜拉桥拉索或主梁损伤程度的增加而增大,且大于相应的损伤报警阈值. 在工程结构的使用过程中,可根据实测数据长期、连续地计算并观察指标FI的大小及其变化情况,在FI 值超过报警阈值时给出报警信号.
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| 关 键 词： | 模态柔度 损伤预警指标 斜拉桥 拉索损伤 主梁损伤 |
Method of structural damage prewarning based on modal flexibility change index |
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| Zhao Ling,Li Aiqun.Method of structural damage prewarning based on modal flexibility change index[J].Journal of Southeast University(Natural Science Edition),2009,39(5). |
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| Authors: | Zhao Ling Li Aiqun |
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| Institution: | Zhao Ling1,2 Li Aiqun1(1School of Civil Engineering,Southeast University,Nanjing 210096,China)(2College of Civil Science , Engineering,Yangzhou University,Yangzhou 225009,China) |
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| Abstract: | A damage prewarning index FI is proposed based on the flexibility matrix corresponding to the measured DOF(degree of freedom) and the characteristic that the structural flexibility increases with damage.The steps for damage prewarning or abnormality detection using the index are presented.The sensitivity of the damage prewarning index is analyzed for the case with and without noise.The damage-alarming threshold of the index can be obtained by measured modal data from periodical detection or structural healt... |
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| Keywords: | modal flexibility damage prewarning index cable-stayed bridge cable damage girder damage |
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