COMMENTS ON CONVENTIONAL DESIGN OF RETAINING STRUCTURES, A DISCUSSION

The discussant considers the authors practice of designing for a tie-rod load of double that calculated by conventional methods using triangular pressure distribution in a sheet pile bulkhead, and describes his practice of calculating the active pressure and redistibution of this as a rectangle of the same area. This leads to a higher tie-rod load. The discussant describes a specific case and explains why the tie-rods of a sheet bile wall failed one after the other until the wall collapsed. The question of why some tie-rods do not fail is also considered. The factor of safety commonly used in steel is perhaps two on yield stress and as high as four on ultimate stress. Thus if the tie-rod load is actually twice that calculated, one is at the yield point but failure does not occur. With high tensile steel, yield and failure are close together and the safety factor is perhaps 1.2 on yield and 1.3 on ultimate. A tie-rod load 1.5 times that calculated will therefore cause failure. Traditional methods of design in this problem are little better than "rule of thumb" and one cannot extrapolate from the "rule of thumb."

  • Supplemental Notes:
    • A discussion of COMMENTS ON CONVENTIONAL DESIGN OF RETAINING STRUCTURES by L. Casagrande, Proc Paper 9568, Feb., 1973
  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  USA  10017-2398
  • Discussers:
    • Golder, H Q
  • Publication Date: 1972

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Filing Info

  • Accession Number: 00262401
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM