Application of the Universal&nbsp;&nbsp; Frequency Response Function Method Based on Traveling Wave Decomposition in Nondestructive Testing and Assessment of Post-disaster Tall Platform Pile Foundation

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (19) : 21-28.

Application of the Universal Frequency Response Function Method Based on Traveling Wave Decomposition in Nondestructive Testing and Assessment of Post-disaster Tall Platform Pile Foundation

LI Zhen-ya1, WANG Kui-hua1, WU Wen-bing2

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Abstract

The universal frequency response function method based on traveling wave decomposition is put forward aiming at the limitation of the existing methods in nondestructive testing and assessment of post-disaster tall platform pile foundation. Firstly, the reaction of the pile cap acting on the pile head is simplified as complex impedance, and the universal frequency response function of the test section is calculated by using wave equation analysis program. Then, the information contained in the universal frequency response function is switched from the frequency domain to the time domain by virtually applying a half-sine pulse at the test section. As a result, the time domain response curve of the virtually isolated single pile below the test section is obtained. Finally, a parametric study was undertaken to investigate the influences of pile-soil parameters on universal frequency response function as well as the time domain response translated from it. The results show that the method proposed can completely eliminate the influence of the superstructure, which simplifies the testing procedure and reduces the difficulty of analysis.

Key words

Bridge engineering / Nondestructive test / Universal frequency response function / Tall platform pile / Traveling wave decomposition / Wave equation analysis program

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LI Zhen-ya1, WANG Kui-hua1, WU Wen-bing2. Application of the Universal Frequency Response Function Method Based on Traveling Wave Decomposition in Nondestructive Testing and Assessment of Post-disaster Tall Platform Pile Foundation[J]. Journal of Vibration and Shock, 2017, 36(19): 21-28

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