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基于应变模态响应重构的损伤识别方法

邹云峰 卢玄东 阳劲松 何旭辉

邹云峰, 卢玄东, 阳劲松, 何旭辉. 基于应变模态响应重构的损伤识别方法[J]. 工程力学, 2022, 39(9): 225-233. doi: 10.6052/j.issn.1000-4750.2021.06.0419
引用本文: 邹云峰, 卢玄东, 阳劲松, 何旭辉. 基于应变模态响应重构的损伤识别方法[J]. 工程力学, 2022, 39(9): 225-233. doi: 10.6052/j.issn.1000-4750.2021.06.0419
ZOU Yun-feng, LU Xuan-dong, YANG Jin-song, HE Xu-hui. A DAMAGE IDENTIFICATION METHOD BASED ON STRAIN MODAL RESPONSE RECONSTRUCTION[J]. Engineering Mechanics, 2022, 39(9): 225-233. doi: 10.6052/j.issn.1000-4750.2021.06.0419
Citation: ZOU Yun-feng, LU Xuan-dong, YANG Jin-song, HE Xu-hui. A DAMAGE IDENTIFICATION METHOD BASED ON STRAIN MODAL RESPONSE RECONSTRUCTION[J]. Engineering Mechanics, 2022, 39(9): 225-233. doi: 10.6052/j.issn.1000-4750.2021.06.0419

基于应变模态响应重构的损伤识别方法

doi: 10.6052/j.issn.1000-4750.2021.06.0419
基金项目: 国家自然科学基金项目(52078504,51925808,U1934209)
详细信息
    作者简介:

    邹云峰(1984−),男,湖南邵阳人,副教授,博士后,博导,主要从事结构抗风研究(E-mail: yunfengzou@csu.edu.cn)

    卢玄东(1997−),男,广西梧州人,硕士生,主要从事动力响应重构研究(E-mail: 574148091@qq.com)

    何旭辉(1975−),男,贵州遵义人,教授,博士,博导,主要从事桥梁抗风与评估研究(E-mail: xuhuihe@csu.edu.cn)

    通讯作者:

    阳劲松(1990−),男,湖南邵阳人,讲师,博士,主要从事健康监测与可靠度评估研究(E-mail: yangjs@csu.edu.cn)

  • 中图分类号: TU17

A DAMAGE IDENTIFICATION METHOD BASED ON STRAIN MODAL RESPONSE RECONSTRUCTION

  • 摘要: 土木结构的损伤识别技术对提升结构可靠性与安全性具有重要意义,也是土木结构健康监测研究中的热点问题。现有的损伤识别方法往往需要识别模态参数,或者需要准确获取结构外部载荷信息,极大限制了相关方法在实际工程中的应用。为克服现有方法的局限性,该文将结构动态响应重构方法引入到损伤识别中,提出了基于应变模态响应重构的损伤识别方法。构建结构健康状态的有限元模型,以损伤结构测量的信号输入,通过基于经验模态分解的应变重构方法,可以获取使用无损伤模型的结构全局模态响应。以传感器采集的模态响应和重构模态响应的差异作为有限元模型修正的依据,通过应变模态比值构建的传递率的灵敏度矩阵进行迭代运算,求得损伤位置及损伤程度。该方法无需获取结构的外部激励信息,通过高效的时域应变重构,能够在少量测量信号下实现对结构损伤的精确识别。为验证该方法的准确性和高效性,开展了连续梁单一损伤和多损伤识别研究,探讨了测量噪声和模态阶次选取对识别结果的影响,结果表明,该方法能够准确、高效识别不同程度的损伤,对测量噪声具有较强的鲁棒性。
  • 图  1  损伤识别流程图

    Figure  1.  Flowchart of damage identification method

    图  2  连续梁模型

    Figure  2.  Model of continuous beam

    图  3  损伤识别结果

    Figure  3.  Damage identification results

    图  4  5%噪声下的损伤识别结果

    Figure  4.  Damage identification results under 5% noise

    图  5  10%噪声下的损伤识别结果

    Figure  5.  Damage identification results under 10% noise

    图  6  15%噪声下的损伤识别结果

    Figure  6.  Damage identification results under 15% noise

    图  7  16号单元应变数据的傅里叶谱

    Figure  7.  Fourier spectrum of strain data of Element 16

    图  8  不同模态组合下的损伤识别结果

    Figure  8.  Damage identification results under different modal combinations

    表  1  损伤工况

    Table  1.   Damage condition

    工况编号损伤描述
    工况1 16号单元5%损伤
    工况2 16号单元20%损伤
    工况3 8号单元5%损伤
    工况4 8号单元20%损伤
    工况5 8号和16号单元5%损伤
    工况6 8号、16号和22号单元5%损伤
    下载: 导出CSV

    表  2  模态组合

    Table  2.   Damage condition

    组合1单元3~13、18~28应变的一阶模态
    单元1~10、13~18、21~30应变的二阶模态
    组合2单元1~10、13~18、21~30应变的二阶模态
    单元3~7、9~14、17~24、24~28应变的三阶模态
    组合3单元15~16应变的一阶模态
    单元11~12、19~20应变的二阶模态
    单元5~10、21:26应变的三阶模态
    单元1~4、27~30应变的四阶模态
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-06-02
  • 修回日期:  2021-08-27
  • 网络出版日期:  2021-09-10
  • 刊出日期:  2022-09-01

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