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Proceedings Paper

Damage detection on the joint of steel frame through high-frequency admittance signals
Author(s): Dansheng Wang; Hongping Zhu; Huaqiang Zhou; Haiping Yang
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Paper Abstract

The basic idea of a piezoelectric admittance (reciprocal of impedance) technique for structural health monitoring is presented in this paper. An experimental study on damage detection of a steel frame structure is operated by the use of the high-frequency piezoelectric admittance signals. In this experiment, three PZT active sensors are bonded to three different components around a joint of the steel frame separately, and the looseness of bolts is identified by monitoring the variations of piezoelectric admittance measurements. From the experimental results it is found that the PZT active sensors hold the ability to detect structural local damage, i.e. they are insensitive to the damage in far fields. Subsequently, two damage indexes, the covariance and the cross correlation coefficient between two real admittance data sets are defined respectively, by which the extent of damage of the frame structure is evaluated. It is found that the cross correlation coefficient index can correctly reflect the damage extent of the frame structure qualitatively in different frequency ranges, but the covariance index can not.

Paper Details

Date Published: 25 August 2009
PDF: 6 pages
Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73753J (25 August 2009); doi: 10.1117/12.839258
Show Author Affiliations
Dansheng Wang, Huazhong Univ. of Science and Technology (China)
Hongping Zhu, Huazhong Univ. of Science and Technology (China)
Huaqiang Zhou, Huazhong Univ. of Science and Technology (China)
Haiping Yang, Huazhong Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 7375:
ICEM 2008: International Conference on Experimental Mechanics 2008
Xiaoyuan He; Huimin Xie; YiLan Kang, Editor(s)

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