PILE LOAD TESTS: CYCLIC LOADS AND VARYING LOAD RATES. DISCUSSION AND CLOSURE

Audibert and Dover report on the results of tests using a range of pile diameters and loading rates greater than those of the authors'. Instead of the authors' proposed "residual strength surface", they attribute the lower capacities in the second series of tests to the effect of strain reversal in the first series. They also propose that the loading rate be expressed as a percentage of static ultimate capacity of the pile per unit of time and note that an increase in stiffness less than or equal to a 2 over 4 order would be in better agreement with the authors' data than a 3-12 over 4 order of magnitude. They also point out the loading rates of ocean waves or earthquake loadings are 4-6 order of magnitude greater than static loads and 2-4 as stated by the authors. Hamilton is of the opinion that the authors' results indicating loss of frictional capacity after 320 days in 3 of the four pile stem from assigning analytical design values to adjust for unknown and bearing terms, rather than analyses strictly on field results. In the authors' reply, they note that the soil around 2 of the piles did not experience large strain reversals. Since there is no standard reference rate of loading for a static pile test, variations in definition will lead to difference of at least 2 orders of magnitude ocean waves or earthquake loading rates.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/3519342
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Kraft Jr, M L
  • Cox, W R
  • VERNER, E A
• Discussers:
  • Audibert, A M
  • Dover, A R
  • Hamilton, T K
• Publication Date: 1982-3

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 501-509
• Serial:
  • Journal of Geotechnical and Geoenvironmental Engineering
  • Volume: 108
  • Issue Number: GT3
  • Publisher: American Society of Civil Engineers
  • ISSN: 1090-0241
  • Serial URL: http://ojps.aip.org/gto

Subject/Index Terms

• TRT Terms: Breaking loads; Earthquakes; Elastic waves; Loads; Ocean waves; Repeated loads; Skin resistance; Static loads; Support piles
• Uncontrolled Terms: Loading rate
• Old TRIS Terms: Pile lateral loads
• Subject Areas: Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00349927
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 30 1982 12:00AM