Earthquakes and Structures

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Effect of poorly-compacted backfill around embedded foundations on building seismic response

  • Kim, Yong-Seok (Dept. of Architectural Engineering, Mokpo National University)
  • Received : 2011.12.09
  • Accepted : 2012.04.10
  • Published : 2012.06.25
⟨ Previous Next ⟩

Abstract

Many building foundations are embedded, however it is not easy to compact the backfill around the foundation especially for the deeply embedded ones. The soil condition around the embedded foundation may affect the seismic response of a building due to the weak contact between the soil and the foundation. In this paper, the response accelerations in the short-period range and at the period of 1 second (in the long-period range) for a seismic design spectrum specified in the IBC design code were compared considering perfect and poor backfills to investigate the effect of backfill compaction around the embedded foundation. An in-house finite-element software (P3DASS) which has the capability of horizontal pseudo-3D seismic analysis with linear soil layers was used to perform the seismic analyses of the structure-soil system with an embedded foundation. Seismic analyses were carried out with 7 bedrock earthquake records provided by the Pacific Earthquake Engineering Research Center (PEER), scaling the peak ground accelerations to 0.1 g. The results indicate that the poor backfill is not detrimental to the seismic response of a building, if the foundation is not embedded deeply in the soft soil. However, it is necessary to perform the seismic analysis for the structure-soil system embedded deeply in the soft soil to check the seismic resonance due to the soft soil layer beneath the foundation, and to compact the backfill as well as possible.

Keywords

Acknowledgement

Supported by : Mokpo National University

References

  1. Borcherdt, R.D. (1994), "Estimates of site-dependent response spectra for design (methodology and justification)", Earthq. Spectra, 10(4), 617-653. https://doi.org/10.1193/1.1585791
  2. Cai, Y. and Hu, X. (2010), "Vertical vibrations of a rigid foundation embedded in a poroelastic half space", J. Eng. Mech.-ASCE, 136(3), 390-398. https://doi.org/10.1061/(ASCE)0733-9399(2010)136:3(390)
  3. Dicleli, M., Albhaisi, S. and Mansour, M.Y. (2005), "Static soil-structure interaction effects in seismic-isolated bridges", Practice Period. Struct. Des. Constr.-ASCE, 10(1), 22-33. https://doi.org/10.1061/(ASCE)1084-0680(2005)10:1(22)
  4. Dobry, R., Borcherdf, R.D., Crouse, C.B., Idriss, I.M., Joyner, W.B., Martin, G.R., Power, M.S., Rinne, E.E. and Seed, R.B. (2000), "New site coefficients and site classification system used in recent building seismic code provisions", Earthq. Spectra, 16(1), 41-67. https://doi.org/10.1193/1.1586082
  5. Gazetas, G. and Tassoulas, J.L. (1987), "Horizontal stiffness of arbitrarily shaped embedded foundations", J. Geotech. Eng.-ASCE, 113(5), 440-457. https://doi.org/10.1061/(ASCE)0733-9410(1987)113:5(440)
  6. International Building Code Council(IBC) (2009), 2009 International building code (IBC2009), 340-366.
  7. Kausel, E. (1974), Forced vibrations of circular foundations on layered media, Research report R74-11, Department of Civil Engineering, MIT.
  8. Kim, Y.S. (1987), Dynamic response of structures on pile foundations, Ph.D. Dissertation, The University of Texas at Austin.
  9. Kim, Y.S. and Roesset, J.M. (2004), "Effect of nonlinear soil behavior on the inelastic seismic response of a structure", Int. J. Geomech., 4(2), 104-114. https://doi.org/10.1061/(ASCE)1532-3641(2004)4:2(104)
  10. PEER Strong Earthquake Data Base, http://peer.berkeley.edu/smcat/search.html/
  11. Rayhani, M.H.T. and Naggar, M.H.E. (2008), "Numerical modeling of seismic response of rigid foundation on soft soil", Int. J. Geomech.-ASCE, 8(6), 336-346. https://doi.org/10.1061/(ASCE)1532-3641(2008)8:6(336)
  12. Roesset, J.M. (1980), A review of soil-structure interaction, Lawrence Livermore Laboratory, 125.
  13. Roesset, J.M. and Kim, Y.S. (1987), "Specification of control motions for embedded foundations", Proceeding of the 5th Canadian Earthquake Engineering Conference, Ottawa, Canada.
  14. Rollins, K.M., Gerber, T.M. and Kwon, K.H. (2010), "Increased lateral abutment resistance from gravel backfills of limited width", J. Geotech. Geoenviron., 136(1), 230-238. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000195
  15. Zhang, Y., Conte, J.P., Yang, Z., Elgamal, A., Bielak, J. and Acero, G. (2008), "Two-dimensional nonlinear earthquake response analysis of a bridge-foundation-ground system", Earthq. Spectra, 24(2), 343-386. https://doi.org/10.1193/1.2923925

Cited by

  1. Pseudo 3D FEM analysis for wave passage effect on the response spectrum of a building built on soft soil layer vol.8, pp.5, 2015, https://doi.org/10.12989/eas.2015.8.5.1241