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Non linear response of fixed offshore platforms to seismic excitation including soil-pile-structure interaction

Zargar, E ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1115/OMAE2008-57372
  3. Publisher: 2008
  4. Abstract:
  5. A nonlinear seismic soil-pile-structure interaction (SSPSI) analysis of fixed offshore platforms constructed on pile foundations including both vertical and battered piles is presented. The analysis is carried out in time domain and the effects of soil nonlinearity, discontinuity at pile soil interfaces, energy dissipation through soil radiation damping, formation of soil layers on bed rock, structural material nonlinearity and geometrical nonlinearity are considered. A combination of FEM approach and BNWF approach is used in modeling pile (substructure), platform structure (superstructure) and soil media. Gapping in clay is modeled by a special connector configuration. To find out the ground motion of soil layers caused by earthquake excitations at bed rock, a nonlinear site response analysis is performed. The effects of soil-pile-structure interaction on nonlinear seismic analysis of offshore platforms are discussed. It is generally concluded that considering soil-pile-structure interaction causes higher deflections and lower stresses in the platform elements due to soil flexibility, nonlinearity and radiation damping and leads to a more feasible and realistic platform design. The sequence of generation of plastic zones in the structure and their distribution are also investigated. Sensitivity of results to soil layers configuration and soil material damping ratio are discussed. Copyright © 2008 by ASME
  6. Keywords:
  7. Bed rocks ; Earthquake excitation ; Fixed offshore platforms ; Geometrical non-linearity ; Ground motions ; Lower stress ; Non-linear response ; Non-Linearity ; Nonlinear seismic analysis ; Off shore platforms ; Pile-soil interface ; Plastic zones ; Platform design ; Platform elements ; Radiation damping ; Seismic excitations ; Sensitivity-of-results ; Site response analysis ; Soil flexibility ; Soil layer ; Soil materials ; Soil media ; Soil nonlinearity ; Soil-pile-structure interactions ; Structural materials ; Time domain ; Arctic engineering ; Damping ; Drilling platforms ; Energy dissipation ; Nonlinear analysis ; Offshore structures ; Pile foundations ; Piles ; Production platforms ; Radiation effects ; Seismology ; Soil structure interactions ; Time domain analysis ; Soils
  8. Source: Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 15 June 2008 through 20 June 2008, Berlin ; Volume 1 , 2008 , Pages 335-345 ; 9780791848234 (ISBN)
  9. URL: https://asmedigitalcollection.asme.org/OMAE/proceedings-abstract/OMAE2008/48180/335/328627