Earthquakes and Structures

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Seismic analysis of turbo machinery foundation: Shaking table test and computational modeling

  • Tripathy, Sungyani (Applied Mechanics Department, Sardar Vallabhbhai National Institute of Technology) ;
  • Desai, Atul K (Applied Mechanics Department, Sardar Vallabhbhai National Institute of Technology)
  • Received : 2016.07.03
  • Accepted : 2017.06.19
  • Published : 2017.06.25
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Abstract

Foundation plays a significant role in safe and efficient turbo machinery operation. Turbo machineries generate harmonic load on the foundation due to their high speed rotating motion which causes vibration in the machinery, foundation and soil beneath the foundation. The problems caused by vibration get multiplied if the soil is poor. An improperly designed machine foundation increases the vibration and reduces machinery health leading to frequent maintenance. Hence it is very important to study the soil structure interaction and effect of machine vibration on the foundation during turbo machinery operation in the design stage itself. The present work studies the effect of harmonic load due to machine operation along with earthquake loading on the frame foundation for poor soil conditions. Various alternative foundations like rafts, barrette, batter pile and combinations of barrettes with batter pile are analyzed to study the improvements in the vibration patterns. Detailed computational analysis was carried out in SAP 2000 software; the numerical model was analyzed and compared with the shaking table experiment results. The numerical results are found to be closely matching with the experimental data which confirms the accuracy of the numerical model predictions. Both shake table and SAP 2000 results reveal that combination of barrette and batter piles with raft are best suitable for poor soil conditions because it reduces the displacement at top deck, bending moment and horizontal displacement of pile and thereby making the foundation more stable under seismic loading.

Keywords

References

  1. Bhatia, K.G. (2008), Foundations For Industrial Machines-A Handbook for Practising Engineers, D-CAD Publishers, New Delhi, ND, India.
  2. Fattah, M.Y., Al-Neami, M.A. and Jajjawi, N.H. (2014), "Resonance frequency of machine foundations resting on saturated sands", International Conference Civil Engineering for Sustainability and Resilience, Amman, Jordan, April.
  3. Fattah, M.Y., Al-Nakdy, I.A.M. and Hamood, M.J. (2015a), "Finite-element analysis of a piled machine foundation", Struct. Build., Proc. Inst. Civ. Engineers, 168(6), 421-432. https://doi.org/10.1680/stbu.14.00053
  4. Fattah, M.Y., Salim, N.M. and Al-Shammary, W.T. (2015b), "Effect of embedment depth on response of machine foundation on saturated sand", Arab. J. Sci. Eng., 40(11), 3075-3098. https://doi.org/10.1007/s13369-015-1793-8
  5. Fattah, M.Y., Al-Mosawi, M.J. and Al-Ameri, A.F.I. (2016a), "Dynamic response of saturated soil-Foundation system acted upon by vibration", J. Earthq. Eng., 1-31.
  6. Fattah, M.Y., Al-Mosawi, M.J. and Al-Ameri, A.F.I. (2016b), "Vibration response of saturated sand-foundation system", Earthq. Struct., 11(1), 83-107. https://doi.org/10.12989/eas.2016.11.1.083
  7. Fattah, M.Y., Karim, H.H. and Al-Recaby, M.K.M. (2016c), "Dynamic behavior of pile group model in two-Layer sandy soil subjected to lateral earthquake excitation", Global J. Eng. Sci. Res. Manage., 3(8), 57-80.
  8. Ghazavi, M., Ravanshenas, P. and Lavasan, A.A. (2014), "Analytical and numerical solution for interaction between batter pile group", KSCE J. Civ. Eng., 18(7), 2051-2063. https://doi.org/10.1007/s12205-014-0082-5
  9. Giannakou, A., Gerolymos, N., Gazetas, G., Tazoh, T. and Anastasopoulos, I. (2010), "Seismic behavior of batter Piles: elastic response", J. Geotech. Geoenviron. Eng., 136(9), 1187-1199. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000337
  10. Haeri, S.M., Kavand, A., Rahmani, I. and Torabi, H. (2012), "Response of a group of piles to liquefaction-induced lateral spreading by large scale shake table testing", Soil Dyn. Earthq. Eng., 38, 25-45. https://doi.org/10.1016/j.soildyn.2012.02.002
  11. Hokmabadi, A.S., Fatahi, B. and Samali, B. (2014), "Assessment of soil-pile-structure interaction influencing seismic response of mid-rise buildings sitting on floating pile foundations", Comput. Geotech., 55, 72-86.
  12. Hokmabadi, A.S. and Fatahi, B. (2015a), "Influence of foundation type on seismic performance of buildings considering soilstructure interaction", Int. J. Struct. Stab. D., 16(8), 1-29.
  13. Hokmabadi, A.S., Fatahi, B. and Samali, B. (2015b), "Physical modeling of seismic soil-pile-structure interaction for buildings on soft soils" Int. J. Geomech., 15(2), 1-18.
  14. Kramer, S.L. (1996), Geotechnical Earthquake Engineering, Prentice Hall, Delhi, India.
  15. Kumar, A., Choudhury, D. and Katzenbach, R. (2016), "Effect of earthquake on combined pile-raft foundation", Int. J. Geomech., 16(3), 1-16.
  16. Lakshmanan, N., Gopalakrishnan, N., Rama Rao, G.V. and Sathish kumar, K. (2009), "Dynamic stiffness based computation of response for framed machine foundations", Geomech. Eng., 1(2), 121-142. https://doi.org/10.12989/gae.2009.1.2.121
  17. Liu, Z. (2013), "Design of foundations for large dynamic equipment in a high seismic region", Structures Congress, Pittsburgh, Pennsylvania, USA, May.
  18. Nazir, A. and Nasr, A. (2013), "Pullout capacity of batter pile in sand", J. Adv. Res., 4(2), 147-154. https://doi.org/10.1016/j.jare.2012.04.001
  19. Nguyen, Q.V., Fatahi, B. and Hokmabadi, A.S. (2016), "The effects of foundation size on the seismic performance of buildings considering the soil-foundation-structure interaction", Struct. Eng. Mech., 58(6), 1045-1075. https://doi.org/10.12989/sem.2016.58.6.1045
  20. PEER ground motion database (2016), http://ngawest2.berkeley.edu/, University of California, Berkeley, CA.
  21. Pitilakis, D., Dietz, M., Wood, D.M., Clouteau, D. and Modaressi, A. (2008), "Numerical simulation of dynamic soil-structure interaction in shaking table testing", Soil Dyn. Earthq. Eng., 28(6), 453-467. https://doi.org/10.1016/j.soildyn.2007.07.011
  22. Rajkumar, K., Ayothiraman, R. and Matsagar, V. (2014), "Influence of soil-structure interaction on pile-supported machine foundations", Structural Engineering Convention (SEC), Delhi, India, December.
  23. Ramaswamy, S.D. and Pertusier, E.M. (1986), "Construction of barrettes for high-rise foundations", J. Constr. Eng. Manage., 112(4), 455-462. https://doi.org/10.1061/(ASCE)0733-9364(1986)112:4(455)
  24. Su, L., Liang, T, Xianzhang, L., Chunhui, L. and Xiaoyu, Z. (2016), "Pile response to liquefaction-induced lateral spreading: a shake-table Investigation", Soil Dyn. Earthq. Eng., 82, 196-204. https://doi.org/10.1016/j.soildyn.2015.12.013
  25. Towhata, I. (2008), Geotechnical Earthquake Engineering, Berlin Heidelberg: Springer-Verlag.
  26. Tripathy. S. and Desai. A. (2016), "Investigation of dynamic behaviour for turbo generator frame foundation through experimental and computational approach", Int. J. Geotech. Eng., 1-11.