Damage Detection of Rigid-Frame Arch Bridge Based on Flexibility Curvature Gradient

被引：0
|
作者：
Zhou Y. [1 ]
Di S. [1 ]
Xiang C. [1 ,2 ]
Wang L. [1 ,2 ]
机构：
[1] Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou
[2] Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou
来源：
| 1600年 / Editorial Board of Journal of Basic Science and卷 / 25期
关键词：
Curvature gradient; Damage detection; Dynamic model updating; Flexibility matrix; Rigid-frame arch bridge; Truncated distribution;
D O I：
10.16058/j.issn.1005-0930.2017.06.013
中图分类号：
学科分类号：
摘要：
The indicator based on the flexibility was vulnerable to low order modes in damage identification. The new damage detection indicator that called Flexibility Curvature Gradient (FCG) based on the penetrating properties of flexibility matrix was proposed. The new indicator is the gradient vector of the center element in matrix scalar field which was calculated by the extension of flexibility curvature matrix in a scalar field. It was proved in rigid-frame arch bridge model which was established by the measured structural parameters and the dynamic model updated with Relative Error (ER) and Modal Assurance Criteria (MAC) in order to get more real and credible proving results. The capability of noise immunity of FCG was verified by the updating error model based on the model of truncated Gaussian distribution. Results are showed that, the verification method based on the dynamic model updating is original and reasonable, truncated Gaussian distribution error can reflect the test error distribution better, FCG can easily identify the single and multiple damages of numerical example, FCG is workable even when the truncated Gaussian distribution error level has reached 10%. Based on above analysis, the work can lay the foundation for the FCG in damage detecting of complex structure and the actual bridge. © 2017, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：1211 / 1221
页数：10
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