HOW TO DESIGN PILES AGAINST UPLIFT

IT IS POSSIBLE TO DESIGN TIMBER PILES AGAINST UPLIFT. THE ULTIMATE UPLIFT CAPACITY MAY BE COMPUTED BY SUMMING THE SOIL -PILE UNIT SHEAR STRENGTH OF EACH LAYER TIMES THE CONTACT AREA. FOR SHORT-TERM, UPLIFT FORCES, ALL SOILS PENETRATED MAY BE ASSUMED TO PROVIDE RESISTANCE. A REDUCTION FACTOR SHOULD BE APPLIED TO THE STRENGTH OF STIFF TO HARD CLAYS AS WELL AS TO THOSE SOILS DISTURBED BY SPUDDING, JETTING, OR PRE-DRILLING. FOR LONG-TERM UPLIFT FORCES, THE TENDENCY FOR CREEP OR RELAXATION IN SOFTER SOILS MUST ALSO BE CONSIDERED. IT SHOULD BE NOTED THAT THIS ARTICLE DEALS ONLY WITH ULTIMATE LOAD AND, IN ALL CASES, AN APPROPRIATE FACTOR OF SAFETY MUST BE APPLIED. FURTHERMORE, THE UPLIFT CAPACITY OF THE PILE GROUP MUST ALSO BE CHECKED AND THE ALLOWABLE LOAD REDUCED WHERE THE GROUP EFFICIENCY IS LESS THAN 100 PERCENT. IT SHOULD FURTHER BE NOTED THAT THIS DISCUSSION APPLIES ONLY TO THE RESISTANCE DEVELOPED BETWEEN THE SOIL AND THE PILE, BOTH THE PILE AND THE CONNECTION TO THE SUPERSTRUCTURE MUST BE STRUCTURALLY DESIGNED TO RESIST THE IMPOSED LOADS. /AUTHOR/

  • Supplemental Notes:
    • Vol 45, No 3, PP 6-11
  • Corporate Authors:

    Wood Preserving

    ,    
  • Authors:
    • Lundgren, R
  • Publication Date: 1967-3

Subject/Index Terms

Filing Info

  • Accession Number: 00234015
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 18 1994 12:00AM