| 用应变模态技术诊断梁结构的损伤 |
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| 引用本文： | 顾培英,陈厚群,李同春,邓昌.用应变模态技术诊断梁结构的损伤[J].地震工程与工程振动,2005,25(4):50-53. |
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| 作者姓名： | 顾培英 陈厚群 李同春 邓昌 |
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| 作者单位： | 河海大学,江苏,南京,210098;南京水利科学研究院,江苏,南京,210029;中国水利水电科学研究院,北京,100044;河海大学,江苏,南京,210098;南京水利科学研究院,江苏,南京,210029 |
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| 基金项目： | 水利科技创新项目（SCX2002-16） |
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| 摘 要： | 重点研究损伤对应变模态影响规律及其灵敏程度.根据计算结果,损伤处附近发生突变,损伤30%时突变区为梁长的12.5%.应变模态对非节点损伤非常敏感,应变模态也有明显改变,尤其是跨中损伤第1阶、四分之一跨损伤第3和第2阶.跨中损伤时,1阶应变模态除突变区外大多数应变几乎呈均匀下降趋势.四分之一跨损伤30%时,3阶应变模态第1峰值区及2阶模态第1、第2峰值区应变振型值下降至58.6%、71.9%及84.2%.所以,可利用应变模态的敏感性确定损伤位置和程度.
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| 关 键 词： | 损伤诊断 模态分析 位移模态 应变模态 |
| 文章编号： | 1000-1301（2005）04-0050-04 |
| 收稿时间： | 2004-07-28 |
| 修稿时间： | 2004-07-282004-10-28 |
Application of strain mode in diagnosing damage to beam |
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| Gu Peiying,CHEN Houqun,Li Tongchun,Deng Chang.Application of strain mode in diagnosing damage to beam[J].Earthquake Engineering and Engineering Vibration,2005,25(4):50-53. |
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| Authors: | Gu Peiying CHEN Houqun Li Tongchun Deng Chang |
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| Institution: | 1.Hohai University, Nanjing 210098, China; 2. Nanjing Hydraulic Research Institute, Nanjing 210029, China; 3. China Institute of Water Resources and Hydropower Research, Beijing 100044,China |
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| Abstract: | Strain mode is applied to diagnosing the position and degree of structural damage, because of displacement modal parameter being insensitive to damage. The principles of damage effect on strain mode are studied.Based on the results of beam, it is concluded that strain modes are very sensitive to non-node damage. The abrupt change of strain is found around damage and the range is 12.5 percent of the beam if damage is 30 percent of its height. Furthermore, the change of strain mode is obvious, especially the first strain mode in middle span damage,the third and the second mode in quarter span damage. The value of the first strain mode shows equal downtrend in middle span damage. The first peak value of the third strain mode, the first and the second peak value of the second mode reduce to 58.6, 71.9 and 84.2 percent in quarter span damage of 30 percent. |
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| Keywords: | damage diagnosing modal analysis displacement mode strain mode |
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