BEARING CAPACITY BY VARIATIONAL METHOD

In attempting to determine the validity of the author's estimates of bearing capacity, it was found that there will always be an upper bound (i.e., actual bearing capacity will be less than or equal to that found by the authors) since the cohesion and angle of internal friction actually mobilized along the long-spiral critical rupture surface will be equal to or less than c and phi, respectively. A comparison of the authors' variational solution with that of Prandtl shows the former giving the higher values for a N sub c, though the difference is not too large, especially for low values of phi. In a comparison with those solutions derived from Lundgren and Mortensen's method, the variational solution for N sub gamma exceeds by more than 2.5 times the characteristics solution and approaches the usual factor of safety for bearing capacity, perhaps because of the authors limitation to perfectly smooth sanctions. However, neither the outer stress characteristics nor the normal stress distribution are "perfectly smooth". Work done by DeBeer and Kerisel indicates that bearing capacity may vary widely according to the width of the footing, curvature, and degree of progressive failure, thus emphasizing the difficulty of calculating bearing capacity from small-scale tests.

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  • Supplemental Notes:
    • Discussion of Proceeding Paper 13330 by Michael Garber and Rafael Baker, November, 1977.
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Discussers:
    • Justo, J L
  • Publication Date: 1978-9

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Filing Info

  • Accession Number: 00183217
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13999
  • Files: TRIS
  • Created Date: Nov 14 1978 12:00AM