NDT Using Transmission Line Model to Identify the Defects in Pile Shaft

Abstract:

The behavior of piles having a single defect which may be necking, bulging or of inferior concrete is simulated by an electrical model representing an electrical transmission line. The model successively simulated defective piles embedded in homogeneous soil. Through the interpretation of response curves supported by appropriate mathematical treatment it was possible to study piles having a single defect .The type of defect can be identified from the response curve by comparing the pile head stiffness of suspect pile with that of a similar but sound pile in the same site. The location of the defect can be determined by measuring the interval between resonating peaks at higher frequencies. For the same defect location along the shaft of piles in a given site, it can be differentiated between resonating large peaks for piles with bulging and necking.,The behavior of piles having a single defect which may be necking, bulging or of inferior concrete is simulated by an electrical model representing an electrical transmission line. The model successively simulated defective piles embedded in homogeneous soil. Through the interpretation of response curves supported by appropriate mathematical treatment it was possible to study piles having a single defect .The type of defect can be identified from the response curve by comparing the pile head stiffness of suspect pile with that of a similar but sound pile in the same site. The location of the defect can be determined by measuring the interval between resonating peaks at higher frequencies. For the same defect location along the shaft of piles in a given site, it can be differentiated between resonating large peaks for piles with bulging and necking.

• Periodical: Applied Mechanics and Materials (Volumes 105-107)
• Pages: 1580-1588
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.105-107.1580
• Online since: September 2011
• Authors: Fawzy M. Ragab
• Keywords: Analytic Solution, Nondestructive Testing (NDT), Pile with Single Defect, Transmission Line Model, Vibration Method

References

[1] Paquet, J (1968): Etude vibratoire des pieux en beton, response harmanique anneals Inst. Tech. des bat, et des traveaux publiques. No 245, May, pp.789-803.

[2] Briard, M. (1970), control des pieux par la method des vibrations. Annelas Inst. Tech. des Bat. ET des traveaux publiques. No. 270, June, pp.105-107.

[3] Rhazi,J.(2001), NDT in civil engineering: The case of concrete bridge decks. The journal of nondestructive testing &ultrasonic . IssN 1435-4934, VOL. 6. NO.5

[4] SONG, WOO, S (2001), Non -Destructive Testing Method for the detection of internal defects inside concrete, 10th Asia-Pacific Conference on Non-Destructive Testing .17-21 September 2001 · Brisbane, Australia