Analysis for Axial Vibration and Internal Forces of Totally and Partially Embedded Pile Groups with Flexible Caps

Abstract:

In this paper, a simplified analytical method is developed for the axial harmonic response of totally and partially embedded pile groups in homogeneous and layered soil deposits. Based on BDWF model, finite element sub-structure method is used to setup the dynamic model of cap-pile groups which can precisely simulate kinetic interaction and inertial interaction. A comprehensive parameter study focuses on the influence of caps’ elastic modulus and mass density on pile groups’ dynamic response, and then points out the limition of rigid cap in practical design. An approximate solution is finally presented for the internal forces distributed on pile heads due to pile-to-pile interaction. The solution of above approach was compared with that of traditional simplified model (rigid and massless cap solution) in simulating an in-site experiment and dynamics response of partially embedded pile groups for offshore wind farm.

• Periodical: Advanced Materials Research (Volumes 163-167)
• Pages: 3860-3867
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.163-167.3860
• Online since: December 2010
• Authors: Qing Ren, Mao Song Huang
• Keywords: Dynamic Response, Flexible Caps, Pile Group

References

[1] Kaynia A M, Kausel E. Dynamic stiffness and seismic response of pile groups. Research Report, Dept. of Civil Engineering., MIT, Cambridge, Mass (1982).

[2] Roesset J M. Dynamic stiffness of pile groups. Pile Foundations, Special Publication, ASCE, Vol. 10 (1984), P. 263.

[3] Novak M. Piles under dynamic loads: State of art. in: Proc, 2nd International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, St. Louis, Vol. 3: (1991), p.2433.

[4] Pender M. Aseismic pile foundation design analysis. Bulletin of the New Zealand National Society for Earthquake Engineering, Vol. 26 (1993), pp.49-160.

DOI: 10.5459/bnzsee.26.1.49-160

[5] Padron L A, Aznarez J J, and Maeso O. BEM–FEM coupling model for the dynamic analysis of . piles and pile groups. Engineering Analysis with Boundary Elements, Vol. 31 (2007), p.473.

DOI: 10.1016/j.enganabound.2006.11.001

[6] Padron L A, Aznarez J J, Maeso O. Dynamic analysis of piled foundations in stratified soils by a BEM–FEM model [J]. Soil Dynamics and Earthquake Engineering, Vol. 28 (2008), p.333.

DOI: 10.1016/j.soildyn.2007.07.005

[7] Gazetas G., Makris N. Dynamic pile-soil-pile interaction: Part Ⅰ: Analysis of axial vibration. Earthquake Engineering and Structure Dynamics, Vol. 20 (1991), p.115.

DOI: 10.1002/eqe.4290200203

[8] Mylonakis G, Gazetas G. Vertical vibration and additional distress of pile groups in layered soil. Soils and Foundations, Vol. 38(1998), p.1.

DOI: 10.3208/sandf.38.1

[9] Wu Zh M, Huang M S, Ren Q. Vertical vibration and internal forces of pile groups in layered soil. Journal of Tongji University(Natural science), Vol. 35 (2007), p.446. 2(in Chinese).

[10] Ren Q, Huang M S, Zhong R, Lin Y F. Vertical vibration of partially embedded pile groups. Chinese Journal of Geotechnical Engineering, Vol. 31 (2009), p.13842. (in Chinese).

[11] GB5007-2002 Code for design of building foundation. Beijing: Standards Press of China, 2002(in Chinese).

[12] Hassini S, Woods R D. Dynamic experiments with model pile foundations. in: Proc. 12th international Conference on Soil Mechanics and Foundation Engineering, vol. 2, Rio de Janeiro, (1989), p.1135.

[13] Iguchi M, Luco J E. Vibration of flexible plate on viscoelastic medium. Journal of Engineering Mechanics, ASCE, Vol. 108 (1982), p.1103.

DOI: 10.1061/jmcea3.0002893

[14] Liou G S, Huang Paohan. Effect of Flexibility on Impedance Functions for Circular Foundation. Journal of Engineering Mechanics, ASCE, Vol. 120 (1994), p.1429.

DOI: 10.1061/(asce)0733-9399(1994)120:7(1429)

[15] Mamoon Saifuddin M. Dynamics and seismic behavior of deep foundations, Ph.D. Thesis, State University of New York at Buffalo (1991).

[16] Fukuwa N, WEN Xuezhang. Efficient soil-structure interaction analysis method of a large-scale pile group[A]. In: Proc. 4th U.S. – Japan Workshop on Soil-Structure Interaction, Tsukuba, Japan (2007).

[17] Wang xucheng, Finite element method. Beijing: Tsinghua University Press (2002).

[18] HOU Xingmin, Numerical solution for foundation dynamic impedance matrix and its engineering applications. PhD Thesis, Institute of Engineering Mechanics, China Earthquake Administration (2003).

[19] Nogami T, Novak M. Soil-pile interaction in vertical vibration. Earthquake Engineering and Structural Dynamics, Vol. 4 (1976), p.277.

DOI: 10.1002/eqe.4290040308

[20] Dobry R, Gazetas G. Simple method for dynamic stiffness and damping of floating pile groups[J]. Geotechnique, Vol. 38 (1988), p.557.

DOI: 10.1680/geot.1988.38.4.557