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Estimation and Warning of Fatigue Damage of FRP Stay Cables Based on Acoustic Emission Techniques and Fractal Theory

Li, H. and Huang, Y. and Chen, W. L. and Ma, M. L. and Tao, D. W. and Ou, J. P. (2011) Estimation and Warning of Fatigue Damage of FRP Stay Cables Based on Acoustic Emission Techniques and Fractal Theory. Computer-Aided Civil and Infrastructure Engineering, 26 (7). pp. 500-512. ISSN 1093-9687 . https://resolver.caltech.edu/CaltechAUTHORS:20110901-095639550

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Abstract

A damage assessment and warning method for stay cables based on the acoustic emission (AE) technique and fractal theory was developed. First, the AE signal features of Higuchi's fractal dimension (FD) were analyzed at various scales. The analytical results indicated that the FD was associated with the frequency response. Meanwhile, it was found that the curve length of the original signal reflected the fluctuation of the AE signal in the time domain. Both the FD and the curve length of the original signal were related to damage evolution. Based on the above analysis, a damage index, namely, the FD-based damage assessment index, was defined by the fractal features of AE signals generated by damaged structures, including the curve length of the original signal and its FD. Fatigue tests of glass fiber-reinforced polymer (GFRP) and carbon fiber-reinforced polymer (CFRP) cables with AE sensors were performed to validate the proposed approach. The time-history responses and frequency responses of the AE signals and the corresponding damage modes were analyzed during the entire cyclic loading process. The FD-based damage indices for all the FRP cables were obtained through analysis of the AE signals. The relationships of both the time-history responses and the frequency responses with the FD-based damage index were investigated. The results indicated that the FD-based damage index increased little with the number of loading cycles at the early loading stage but increased dramatically at the final stage of the fatigue test. The results of this article demonstrate that an FD-based damage index can quantify the evolutionary process of fatigue damage in FRP stay cables.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1111/j.1467-8667.2010.00713.xDOIArticle
Additional Information:© 2011 Computer-Aided Civil and Infrastructure Engineering. Issue published online: 9 Aug 2011. Article first published online: 14 Feb 2011. This research was financially supported by the NSFC (grant no. 50525823, 50538020, and 50278029) and by the Ministry of Science and Technology, China (grant no. 2006BAJ03B05, 2007 AA04Z435, and 2006BAJ13B03).
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China50525823
National Natural Science Foundation of China50538020
National Natural Science Foundation of China50278029
Ministry of Science and Technology (China)2006BAJ03B05
Ministry of Science and Technology (China)2007AA04Z435
Ministry of Science and Technology (China)2006BAJ13B03
Issue or Number:7
Record Number:CaltechAUTHORS:20110901-095639550
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20110901-095639550
Official Citation:Li, H., Huang, Y., Chen, W. L., Ma, M. L., Tao, D. W. and Ou, J. P. (2011), Estimation and Warning of Fatigue Damage of FRP Stay Cables Based on Acoustic Emission Techniques and Fractal Theory. Computer-Aided Civil and Infrastructure Engineering, 26: 500–512. doi: 10.1111/j.1467-8667.2010.00713.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25196
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:01 Sep 2011 20:28
Last Modified:25 Oct 2019 21:50

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