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《Journal of Zhejiang University(Engineering Science)》 2013-03
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Application of approximate entropy in concrete structures damage identification

XIE Zhong-kai,LIU Guo-hua(Institute of Hydraulic Structures and Water Environment,Zhejiang University,Hangzhou 310058,China)  
Approximate entropy(ApEn) was introduced to detect damage in reinforced concrete beam structures based on free vibration signal.Decay signal was divided into various categories via auto spectral density function,and different ApEn methods were proposed according to different signal patterns.Cross-correlation function was applied to transform irregular decay signal into regular cross-correlation time series.The feasibility of introducing ApEn into calculating decay signal was validated by numerical simulation and experiment method.Tiny damage in concrete structures could be sensitively detected by applying cross-correlation ApEn method to free vibration signal tested from the experiment under various damage conditions.Various-intensity noise was added to the original tested signal,and the cross-correlation ApEn method was found to be able to recognize the damage under a very low signal-to-noise ratio condition,which confirms that the cross-correlation ApEn method has strong antinoise ability.
【Fund】: 国家自然科学基金资助项目(50579081)
【CateGory Index】: TU375;TU317
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