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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 국제구조공학회 Smart Structures and Systems, An International Journal Smart Structures and Systems, An International Journal Vol.19 No.2
- 발행연도
- 2017.1
- 수록면
- 181 - 194 (14page)
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초록· 키워드
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In order to investigate the interface debonding defects detection mechanism between steel tube and concrete core of concrete-filled steel tubes (CFSTs), multi-physical fields coupling finite element models constituted of a surface mounted Piezoceramic Lead Zirconate Titanate (PZT) actuator, an embedded PZT sensor and a circular cross section of CFST column are established. The stress wave initiation and propagation induced by the PZT actuator under sinusoidal and sweep frequency excitations are simulated with a two dimensional (2D) plain strain analysis and the difference of stress wave fields close to the interface debonding defect and within the cross section of the CFST members without and with debonding defects are compared in time domain. The linearity and stability of the embedded PZT response under sinusoidal signals with different frequencies and amplitudes are validated. The relationship between the amplitudes of stress wave and the measurement distances in a healthy CFST cross section is also studied. Meanwhile, the responses of PZT sensor under both sinusoidal and sweep frequency excitations are compared and the influence of debonding defect depth and length on the output voltage is also illustrated. The results show the output voltage signal amplitude and head wave arriving time are affected significantly by debonding defects. Moreover, the measurement of PZT sensor is sensitive to the initiation of interface debonding defects. Furthermore, wavelet packet analysis on the voltage signal under sweep frequency excitations is carried out and a normalized wavelet packet energy index (NWPEI) is defined to identify the interfacial debonding. The value of NWPEI attenuates with the increase in the dimension of debonding defects. The results help understand the debonding defects detection mechanism for circular CFST members with PZT technique.
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참고문헌 (35)
참고문헌 신청
Bhalla, S. / 2004 / High frequency piezoelectric signatures for diagnosis of seismic/blast induced structural damages / NDT & E Int 37(1):23~33
China Engineering Construction standardization association / 2000 / Technical Specification for Inspection of Concrete Defects by Ultrasonic Method / China City Press
Chui, C. K. / 1992 / An Introduction to Wavelets / Academic press
COMSOL Inc
Feng, M. Q. / 2002 / Use of microwaves for damage detection of fiber reinforced polymer-wrapped concrete structures / J. Eng. Mech. -ASCE 128(2):172~183
China Engineering Construction standardization association / 2000 / Technical Specification for Inspection of Concrete Defects by Ultrasonic Method / China City Press
Chui, C. K. / 1992 / An Introduction to Wavelets / Academic press
COMSOL Inc
Feng, M. Q. / 2002 / Use of microwaves for damage detection of fiber reinforced polymer-wrapped concrete structures / J. Eng. Mech. -ASCE 128(2):172~183
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