Centrifuge model test on dynamic behavior of group-pile foundation with inclined piles and its numerical simulation

Abstract

In this paper, dynamic behavior of a group-pile foundation with inclined piles in loose sand has been investigated with centrifuge model tests. The test results are also simulated with elastoplastic dynamic finite element method, in which, not only sectional force of piles, stress of ground, but also deformation of piles are calculated using a three-dimensional elastoplastic dynamic finite element analysis (Code name: DGPILE-3D). The numerical analyses are conducted with a full system in which a superstructure, a pile foundation and surrounding ground are considered together so that interaction between pile foundation and soils can be properly simulated because the nonlinearities of both the pile and the ground are described with suitable constitutive models. Different types of piles, vertical pile or inclined pile, are considered in order to verify the different characteristics of a group pile foundation with inclined piles. The validity of the calculation is verified by the model tests.

References

1. Horikoshi K, Ohtsu H, Kimura M, et al.. Investigation of piles damages by the 1995 Hyogoken-NambuEarthquake. Tsuchi-to-Kiso, 1996, 44(11): 27–29 (in Japanese)
2. Nikolaou A . Kinematicbending moments in seismically stressed piles. NCEER-95-0022, Report.Buffalo: National Center for Earthquake Research, State Universityof New York. 1995
3. Guin J, Banerjee P K . Coupled soil-pile-structureinteraction analysis under seismic excitation. Journal of Structural Engineering, ASCE, 1998, 124(4): 434–444. doi:10.1061/(ASCE)0733‐9445(1998)124:4(434)
4. Gazetas G, Mylonakis G . Seismic soil-structure interaction:new evidence and emerging issues, geotechnical earthquake engineeringand soil dynamics III. In: Dakoulas P, Yegian M K, Holtz R D, eds. Geo-InstituteASCE Conference, ASCE, Seattle, Vol. II. 1998, 1119–1174
5. Matsuda T, Ito K, Toriihara M . Shaking table test and dynamic effective stress analysisof light structure under saturated sandy ground. In: Proc. of 8th Int. Conf. Computer Method and Advance in Geomechanics,Morgantown, Balkema. 1994, 2: 935–941
6. Taji Y, Sato M, Kagawa T, et al.. Investigation on soil-pile-structure interactionin liquefying sand by a large scale shaking-table test and centrifugetest. In: Proc. of the 24th Symposium ofJapan Earthquake Engineering, 1997, 277–280 (in Japanese)
7. Murono T, Nishimura A, Nagazuma M . Model test on a group-pile foundation considering thevibration of ground in seismic evaluation. In: Proc. of the 24th Symposium of Japan Earthquake Engineering. 1997, 625–628 (in Japanese)
8. Fukutake K . Seismicevaluation of a group-pile foundation surrounded by a frame wall usinga 3-D nonlinear dynamic analysis. In: Proc.of the 24th Symposium of Japan Earthquake Engineering. 1997, 673–676 (in Japanese)
9. Taguchi Y, Tateishi A, Oka F, et al.. Numerical simulation of soil-foundation interactionbehavior during subsoil liquefaction. In: Proc. of the 6th Int. Symp. Numerical Models in Geomechanics, Montreal,Balkema. 1997, 561–564
10. Zhang F, Kimura M, Nakai T, et al.. Mechanical behavior of pile foundations subjectedto cyclic lateral loading up to the ultimate state. Soils and Foundations, 2000, 40(5): 1–18
11. Kimura M, Zhang F . Seismic evaluation of pilefoundations with three different methods based on three-dimensionalelasto-plastic finite element analysis. Soils and Foundations, 2000, 40(5): 113–132
12. Zhang F, Yashima A, Kimura M, et al.. 3-D FEM analysis of laterally cyclic loadedgroup-pile foundation based on an axial-force dependent hystereticmodel for RC. In: Proc. of Int. Conf. onGeotechnical and Geological Engineering (GeoEng2000), Melbourne, CD-ROM. 2000
13. Zhang F, Kimura M . Numerical prediction of thedynamic behaviors of RC group-pile foundation. Soils and Foundations, 2002, 42(3): 77–92
14. Nakai T . Anisotropic hardening elasto-plastic model for sand considering thestress path dependency in three-dimensional stresses. Soils and Foundations, 1989, 29(1): 119–137
15. Nakai T, Matsuoka H . A generalized elastoplasticconstitutive model for clay in three-dimensional stresses. Soils and Foundations, 1986, 26(3): 81–98