Non-destructive&nbsp;<span>testing</span> of interfacial debonding defects in concrete-filled steel tubes and its application to the SEG Building health evaluation

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (22) : 20-30.

Non-destructive testing of interfacial debonding defects in concrete-filled steel tubes and its application to the SEG Building health evaluation

CHEN Zhijie1，LIU Hai*1，WU Pei1，LIAO Jingyi1,2，CUI Jie1，ZHOU Fulin1

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Abstract

Concrete-filled steel tube (CFST) structures have been widely applied to the construction of high-rise buildings and large-span bridges due to their excellent mechanical and seismic performance. However, with the increase of service time, the debonding defects between steel tube and core concrete will adversely affect the building safety. In this paper, the ultrasonic phased array method and the acoustic impact method are proposed to detect the debonding defects in concrete-filled steel tubes, and two special-designed inspection instruments are developed. For the ultrasonic phased array method, total focusing method is applied for image reconstruction, and the reflection coefficient at the steel-concrete interface is extracted for debonding evaluation. For the acoustic impact method, the energy distribution of flexural vibration mode and thickness mode in the echo data is analyzed by wavelet transform. The two proposed methods are successfully applied to the health evaluation of Shenzhen SEG Building after the abnormal shaking incident. The debonding defects of the concrete-filled steel tube columns of the SEG Building are detected and the comprehensive debonding ratio are calculated. Results of the field tests show that the comprehensive debonding rate of the SEG building is about 50%, showing a serious debonding degree. Comparative analysis of the detection results of these two methods shows that both the ultrasonic phased array method and the impact acoustics method can be used for semi-quantitative detection of debonding defects in concrete-filled steel tube columns. The impact acoustics method has a higher detection efficiency, while the ultrasonic phased array method has a higher detection resolution and detection accuracy.

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concrete-filled steel tube / debonding defects / non-destructive testing / ultrasonic phased array / acoustic impact

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CHEN Zhijie1, LIU Hai1, WU Pei1, LIAO Jingyi1, 2, CUI Jie1, ZHOU Fulin1. Non-destructive testing of interfacial debonding defects in concrete-filled steel tubes and its application to the SEG Building health evaluation[J]. Journal of Vibration and Shock, 2024, 43(22): 20-30

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