In an effort to establish the comparative breaking strength and scheme of foundation failure in jacking and to elucidate the character of foundation failure in bending, three series of single-block reinforced concrete foundations were planned and subjected to failure in the laboratory. The geometric dimensions of the foundations of the experimental series, their reinforcement, and the strength characteristics of the materials used are tabulated. The foundations of all 3 series were tested on a 120 t hydraulic press by the same method. The foundations were loaded in steps of 2000-5000 kg each. Horizontal cracks appeared in the stepped foundation along the contour of contact of the upper and lower steps up until the exhaustion of the jacking bearing capacity. With further increase of the load there was a partial or complete shearing of the upper step of the foundation. Complete failure of the stepped foundations occurred from jacking of the upper pyramid through the body of the lower step. The scheme of failure of rectangular foundations corresponded to that in the norms. The angle of the slope of the face of the pyramids to the vertical in all experimental foundations varied within 45-60 deg. The different jacking capacity of foundations caused a difference in the scheme of failures of the different foundations series. Observations are made with regard to the relative strength of stepped foundations, the calculated value of the jacking strength of experimental foundations, the formation of cracks and character failure, and compression strains. The character of failure from jacking of stepped foundations differs appreciably from that of rectangular foundations. Shearing of the step, which occurs in a stepped foundation and precedes failure from jacking or bending, lowers its bearing capacity.

  • Supplemental Notes:
    • Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, Vol. 1, No. 4, pp 18-22, July-August 1964.
  • Corporate Authors:

    Consultants Bureau

    227 West 17th Street
    New York, NY  United States  10011
  • Authors:
    • Rivkin, S A
    • Kuznetson, L V
  • Publication Date: 1964-8

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Filing Info

  • Accession Number: 00083783
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 29 1975 12:00AM