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Frontiers of Structural and Civil Engineering

Front Arch Civil Eng Chin    2009, Vol. 3 Issue (2) : 180-186     https://doi.org/10.1007/s11709-009-0026-1
RESEARCH ARTICLE |
Propagation characteristics of transient waves in low-strain integrity testing on cast-in-situ concrete thin-wall pipe piles
Hanlong LIU1,2(), Xuanming DING1,2
1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China
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Abstract

The three-dimensional effects of pile head and the applicability of plane-section assumption are main problems in low-strain dynamic tests on cast-in-situ concrete thin-wall pipe piles. The velocity and displacement responses were calculated by a theoretical formula deduced by the authors. The frequency and influencing factor of high-frequency interference were analyzed. A numerical method was established to calculate the peak value and arrival time of incoming waves on top of the piles. The regularity along circumferential and the influence of radius or impulse width were studied. The applicability of plane-section assumption was investigated by comparison of velocity responses at different points in the sections at different depths. The waveform of velocity response at different points forked after the first peak, indicating that the propagation of stress waves did not well meet the plane- section assumption.

Keywords pipe pile      low strain integrity testing      dynamic response      transient wave      three-dimensional effect     
Corresponding Authors: LIU Hanlong,Email:hliu@hhu.edu.cn   
Issue Date: 05 June 2009
 Cite this article:   
Hanlong LIU,Xuanming DING. Propagation characteristics of transient waves in low-strain integrity testing on cast-in-situ concrete thin-wall pipe piles[J]. Front Arch Civil Eng Chin, 2009, 3(2): 180-186.
 URL:  
http://journal.hep.com.cn/fsce/EN/10.1007/s11709-009-0026-1
http://journal.hep.com.cn/fsce/EN/Y2009/V3/I2/180
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Fig.1  Velocity responses at different points on pile head
Fig.2  Displacement responses at different points pile head
Fig.3  Field measurement waveform of velocity response
Fig.4  Fourier spectrum of field measurement wave
Fig.5  Velocity response spectrum at different points on top of pile
Fig.6  Velocity response spectrum of pipe piles with different radii
Fig.7  Velocity response spectrum of pipe piles with different impulse widths
reference angle of two points/(°)calculational results in this paper/mscalculational results in Ref. [8]/mstest result in Ref. [8]/ms
45-900.0480.0480.050
90-1350.0460.0480.050
135-1800.0520.0480.050
Tab.1  Arrival time of incident wave peaks
Fig.8  Arrival time of incident wave peaks at different points on top of pile with different radii
Fig.9  Arrival time of incident wave peaks at different points on top of pile with different impulse widths
Fig.10  Peak values of incident waves at different points on top of pile with different radii
Fig.11  Peak values of incident waves at different points on top of pile with different impulse widths
Fig.12  Velocity response in section of 5 m in depth
Fig.13  Velocity response in section of 15 m in depth
1 Liu Hanlong, Fei Kang, Ma Xiaohui, Gao Yufeng. Cast-in-situ concrete thin-wall pipe pile with vibrated and steel tube mould technology and its application (I): development and design. Rock and Soil Mechanics , 2003, 24(2): 164–168 (in Chinese)
2 Liu Hanlong, Hao Xiaoyuan, Fei Kang, Chen Yonghui. Field pour concrete thin wall cased pile technology and its application (Ⅱ): application and in-situ test. Rock and Soil Mechanics , 2003, 24(3): 372–375 (in Chinese)
3 Chen Fan, Luo Wenzhang. Dimension effect on low strain integrity testing of prestressed pipe piles. Chinese Journal of Geotechnical Engineering , 2004, 26(3): 353–356 (in Chinese)
4 Huang Dazhi, Chen Longzhu. 3D finite element analysis of reflected waves in concrete pipe pile with defects. Rock and Soil Mechanics , 2005, 26(5): 803–808 (in Chinese)
5 Chow Y K, Phoon K K, Chow W F, Wong K Y. Low strain integrity testing of piles: three-dimensional effects. Journal of Geotechnical and Geoenvironmental Engineering , 2003, 129(11): 1057–1062
doi: 10.1061/(ASCE)1090-0241(2003)129:11(1057)
6 Gazis D C. Three-dimensional investigation of the propagation of waves in hollow circular cylinders: I. analytical foundation. Journal of the Acoustical Society of America , 1959, 31(5): 568–573
doi: 10.1121/1.1907753
7 Liu Hanlong, Ding Xuanming. Analytical solution of the dynamic response of cast-in-situ concrete thin-wall pipe pile under low strain transient concentrated load. Chinese Journal of Geotechnical Engineering , 2007, 29(11): 1611–1617 (in Chinese)
8 Luo Wenzhang. Velocity response study on pipe piles under low strain transient concentrated load. Beijing: China Academy of Building Research, 2002 (in Chinese)
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