COMPARISON OF METHODS FOR ESTIMATING PILE CAPACITY. FINAL REPORT

A comparative study of ten pile driving formulas is described. The formulas are the Danish, ENR, Modified ENR, Eytelwein, Gates, Hiley, Janbu, Navy-Mckay, PCUBC, and Weisbach. The ultimate load for each of sixty-three pile load tests was determined using the Q-D over 30 method to determine ultimate capacity. The predicted pile capacity was divided by the measured capacity to obtain normalized values. Statistical analyses for coefficient of variation were performed on the logarithm of the normalized capacities to determine which formula provided the most consistent prediction of pile capacity. The Gates formula proved to be the best and the widely used ENR one of the worst with a coefficient of variation approximately 2-3 times higher than that for the Gates formula.

  • Record URL:
  • Corporate Authors:

    Washington State University, Pullman

    Department of Civil and Environmental Engineering
    P.O. Box 642910
    Pullman, WA  United States  99164-2910

    Washington State Department of Transportation

    Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
    Olympia, WA  United States  98504-7300

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • FRAGASZY, R J
    • Higgins, J D
    • Argo, D E
  • Publication Date: 1988-8

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 62 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00478207
  • Record Type: Publication
  • Report/Paper Numbers: WA-RD 163.1
  • Contract Numbers: Y3400, Task 9
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Dec 31 1988 12:00AM