UPLIFT CAPACITY OF FOOTINGS AND ANCHORS FOR TRANSMISSION TOWERS

Research and development by Ontario Hydro as regards the uplift capacity of footings and anchors is reviewed. The work centered largely on augered concrete footings, and on grouted soil anchors, helix anchors and rock anchors. Approximate theories developed from full-scale tests to evaluate the ultimate uplift capacity of the foundation units are described. The uplift capacity of footings and anchors in clay was shown to be much lower under sustained loading than under short-term loading, depending on depth. Grouped anchors in clay showed only a slight decrease in efficiency whereas for rock anchors at fairly shallow depth the loss in efficiency was high. The modes of failure of single and grouped anchors grouted in soft and medium-strength rocks are discussed. /Author/

• Corporate Authors:

  Ontario Hydro, Research Division

  800 Kipling Avenue
  Toronto M8Z 5S4,   Canada 
• Authors:
  • Adams, J I
  • Radhkrishna, H E
• Publication Date: 1977-1

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 7-20
• Serial:
  • Ontario Hydro Research Quarterly
  • Volume: 29
  • Issue Number: 1
  • Publisher: Ontario Hydro, Research Division

Subject/Index Terms

• TRT Terms: Clay; Concrete; Failure; Footings; Foundations; Load tests; Physical properties; Rocks; Towers; Transmission lines; Uplift pressure
• Uncontrolled Terms: Anchors
• Old TRIS Terms: Rock properties
• Subject Areas: Geotechnology; Highways; Research;

Filing Info

• Accession Number: 00172444
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 26 1978 12:00AM