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Damage Identification and Application of Prestressed Concrete Beams Based on Hilbert-Huang Transform
Xiang, Yiqiang Zhang, Xiang Shen, Yonggang
Xiang, Yiqiang
Zhang, Xiang
Shen, Yonggang
Description
Abstract
In this paper, through the analysis of numerical and experimental studies with and without noise, the vibration characteristics of the prestressed concrete beam during failure process were studied. Runge-Kutta method was used to solve the partial differential equations of controlling vibration to obtain dynamic response under hammer excitation. The vibration characteristics of the test beam under different damage conditions were researched by Hilbert-Huang Transformation (HHT) time-frequency analysis method. Concrete strain, deflection and crack development, etc. were recorded during failure process, and dynamic testing of five key working conditions was made. The acceleration signals were obtained from each key condition and HHT was used to get instantaneous frequency-acceleration amplitude curve during each damage stage. The results showed that instantaneous frequency-acceleration amplitude curve obtained by the HHT can clearly reflect the degree of damage, the change of damage characteristic frequency display the extent of damage in the failure process.