CAPACITY OF PILE ANCHORS

EXPERIENCE WITH PILING FOR HIGHWAY STRUCTURES HAS INDICATED A NEED FOR POSITIVE ANCHORAGE OF PILES TO THE SUBSTRUCTURE TO RESIST UPLIFT FORCES. SIX TYPES OF PILE ANCHOR DEVICE, TWO FOR USE WITH STEEL PILES AND FOUR FOR USE WITH TIMBER PILES, WERE CAST IN CONCRETE BLOCKS DESIGNED TO SIMULATE BRIDGE FOOTINGS AND TESTED USING BOTH STATIC AND CYCLIC LOADS TO DETERMINE THE PULL OUT CAPACITY OF THE PILE TO FOOTING CONNECTION. THE RESULTS FROM EACH ANCHOR WERE COMPARED WITH THE DESIRED ALLOWABLE LOAD CAPACITY OF 40% OF THE PILE BEARING CAPACITY AND ALSO WITH THE RESULTS FROM A COMPARABLE STEEL OR TIMBER PILE CONTROL SPECIMEN THAT WAS IDENTICAL TO THE TEST SPECIMEN IN ALL RESPECTS EXCEPT THAT IS CONTAINED NO ANCHOR DEVICE. IT WAS FOUND THAT THE CONTROL SPECIMENS TOGETHER WITH ONE OF THE ANCHOR TYPES WERE SUBJECT TO SUDDEN FAILURES NEAR THEIR ULTIMATE LOAD. ALL OF ULTIMATE AND HAD LOAD CAPACITIES GREATER THAN THE CORRESPONDING CONTROL SPECIMEN AND GREATER THAN 40% OF THE BEARING CAPACITY OF THE CORRESPONDING PILE TYPE. EXCEPT FOR ONE ANCHOR TYPE, ALL ANCHORS WERE CAPABLE OF RESISTING AT LEAST 100 CYCLES OF LOADING (AT A 0.1 CPS LOAD RATE) FROM 0 KIPS TO A LOAD EQUAL TO 40% OF THE BEARING CAPACITY OF THE PILE. ALL ANCHORS THAT WERE RELOADED STATICALLY AFTER CYCLIC LOADING DEMONSTRATED STATIC RELOAD CAPACITIES IN EXCESS OF 40% OF THE BEARING CAPACITY OF THE PILE. /FHWA/

  • Supplemental Notes:
    • Contract D-4-114
  • Corporate Authors:

    California Department of Transportation

    Bridge Department, P.O. Box 1499
    Sacramento, CA  USA  95807
  • Authors:
    • Horn, M W
    • Stewart, C F
    • Boulware, R L
  • Publication Date: 1972-12

Media Info

  • Pagination: 98 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00230776
  • Record Type: Publication
  • Source Agency: California Department of Transportation
  • Report/Paper Numbers: Final Rpt
  • Files: TRIS, STATEDOT
  • Created Date: Jul 16 1974 12:00AM