DYNAMIC STIFFNESS AND SEISMIC RESPONSE OF SLEEVED PILES

An axisymmetric finite element formulation with a consistent transmitting boundary is used to obtain dynamic stiffnesses and seismic response of sleeved piles in linear viscoelastic soil media. A sleeved pile consists of a column within a sleeve of substantially larger diameter which is filled with concrete to some depth below grade level. Recent research on the behavior of pile-foundations under dynamic loads has been stimulated by dynamic behavior studies which have disclosed that the effects study: a finite element formulation with a consistent transmitting boundary to stimulate the soil medium encircling the pile, and an approximate analytical method based on the concept of a generalized Winkler medium. Form the approximate analytical method, closed-form expressions were derived for the dynamic stiffness of the piles. Comparison of the results of the analytical and the finite element formulation methods showed that the analytical method, together with the appropriate subgrade moduli also obtained in this study, provide fairly accurate results for dynamic stiffnesses at low as well as at high frequencies.

• Corporate Authors:

  Massachusetts Institute of Technology

  Construction Facilities Division
  Cambridge, MA  United States  02139

  National Science Foundation

  Division of Problem -Focused Research Applications
  Washington, DC  United States  20550
• Authors:
  • KAYNIA, A M
  • Kausel, E
• Publication Date: 1980-5

Media Info

• Pagination: 62 p.

Subject/Index Terms

• TRT Terms: Analysis; Dynamic loads; Dynamics; Finite element method; Pile foundations; Seismicity; Soil structure interaction; Soils; Static loads; Stiffness; Support piles
• Uncontrolled Terms: Dynamic characteristics; Seismic response; Soil dynamics
• Old TRIS Terms: Analytical method; Pile structures
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00327110
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: MIT-CE-R80-12, NSF/RA-800089
• Contract Numbers: NSF-PER79-02989
• Files: TRIS
• Created Date: Feb 18 1981 12:00AM