Impedance Functions of Piles in Inhomogeneous Media
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Volume 119, Issue 9
Abstract
A new model is presented for characterizing the response of soils within the boundary zone around piles. The proposed concept provides for a continuous variation of soil properties with smooth transition into the outer zone; these properties alleviate the wave reflections from the interface between the two media. With this model the impedances of composite layers do not show the oscillations that are generally observed with the other boundary zone models that take account of the soil mass. The developed impedance functions are used in the dynamic analysis of a field problem involving vertical vibration of a single pile. Comparison of the theoretical predictions with the experimental data in this case indicates that inclusion of the boundary zone results in a reduction in the stiffness and damping for the pile‐soil system which in turn causes a reduction in the resonant frequencies and an increase in the resonant amplitude of piles. The results show that the proposed boundary zone model improves the agreement between the theoretical predictions and field‐measured data.
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References
1.
Dotson, K. W., and Veletsos, A. S. (1990). “Vertical and torsional impedances for radially inhomogeneous viscoelastic soil layers.” Soil Dynamics Earthquake Engrg., 9(3), 110–119.
2.
EL‐Marsafawi, H., Han, Y. C., and Novak, M. (1992). “Dynamic experiments on two pile groups.” J. Geotech. Engrg., ASCE, 118(4), 576–592.
3.
Han, Y. C., and Novak, M. (1988). “Dynamic behaviour of single pile under strong harmonic excitation.” Can. Geotech. J., 25(3), 523–534.
4.
Han, Y. C., and Vaziri, H. (1992). “Dynamic response of pile group under lateral loading.” Soil Dynamic Earthquake Engrg., 11(2), 87–99.
5.
Lakshmanan, N., and Minai, R. (1981). “Dynamic soil reactions in radially nonhomogeneous soil media.” Bull Disaster Prev. Res. Inst., Kyoto Univ., Kyoto, Japan, 79–114.
6.
Nogami, T., Otani, J., Konagai, K., and Chen, H. L. (1992). “Nonlinear soil‐pile interaction model for dynamic lateral motion.” J. Geotech. Engrg., ASCE, 118(1), 89–106.
7.
Novak, M. (1974). “Dynamic stiffness and damping of piles.” Can. Geotech. J., 12(4), 574–598.
8.
Novak, M., and Aboul‐Ella, F. (1978). “Impedance functions of piles in layered media.” J. Engrg. Mech., ASCE, 104(6), 643–661.
9.
Novak, M., and Sheta, M. (1980). “Approximate approach to contact effects of piles.” Proc. Dynamic Response of Pile Foundations: Analytical Aspects, ASCE, New York, N.Y., 53–79.
10.
Novak, M., and Mitwally, H. (1988). “Transmitting boundary for axisymmetrical dilation problems.” J. Engrg. Mech., ASCE, 114(1), 181–187.
11.
Novak, M., and Han, Y. C. (1990). “Impedances of soil layer with boundary zone.” J. Geotech. Engrg., ASCE, 116(6), 1008–1014.
12.
Veletsos, A. S., and Dotson, K. W. (1986). “Impedances of soil layer with disturbed boundary zone.” J. Geotech. Engrg., ASCE, 112(3), 363–368.
13.
Veletsos, A. S., and Dotson, K. W. (1987). “Horizontal impedances for radially inhomogeneous viscoelastic soil layers.” Tech Report NCEZR‐87‐0021, Nat. Ctr. for Earthquake Engrg. Res., State Univ. of New York, Buffalo, N.Y.
14.
Veletsos, A. S., and Dotson, K. W. (1988). “Vertical and torsional vibration of foundations in inhomogeneous media.” J. Geotech. Engrg., ASCE, 114(9), 1002–1021.
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Published In
Journal of Geotechnical Engineering
Volume 119 • Issue 9 • September 1993
Pages: 1414 - 1430
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Sep 4, 1991
Published online: Sep 1, 1993
Published in print: Sep 1993
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