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Cluster analysis and damage identification for FRP/steel-confined RC column using AE technique

  • Du, Fangzhu (School of Civil Engineering, Shandong Jianzhu University) ;
  • Li, Dongsheng (School of Civil Engineering, Dalian University of Technology) ;
  • Qiu, Dapeng (School of Civil Engineering, Shandong Jianzhu University)
  • Received : 2019.03.10
  • Accepted : 2020.11.19
  • Published : 2021.03.25
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Abstract

This article presents the damage evaluation and pattern recognition for the newly proposed fiber reinforced polymer (FRP)/steel-confined reinforced concrete columns. The interaction of FRP material, steel tube, and reinforced concrete lead to complex damage mechanisms and invisible damage modes. The prevailing acoustic emission (AE) technique was applied to monitor the damage process and detect the sheltered damages under cyclic loading. Characteristic AE parameters, such as energy and duration, were extracted to disclose the damage evolution and evaluate the damage state. Three typical damage stages were identified. The fuzzy C-means (FCM) algorithm and particle swarm optimization (PSO) algorithm were applied as efficient clustering tools to discriminate different damage signals of FRP/steel-confined RC columns. Five types of damage mechanisms were identified and illustrated based on the statistical analysis of typical AE features. Furthermore, typical damage waveforms were extracted, the frequency content of each damage signal was discussed on the basis of wavelet transform.

Keywords

Acknowledgement

The authors are grateful for the financial support from the National Natural Science Foundation of China (NSFC) under Grant No. 51778104, and Doctoral Research Fund Project of Shandong Jianzhu University under Grant No. X20026Z0101, and the experimental teaching lab of civil engineering of Shandong Jianzhu University.

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