Brief details are given of three methods used to analyse stress in soil beams composed of compacted clay. Two of the methods, direct method and differential method, apply to the calculation of stresses from the applied bending moment and the strains measured by the radiographic technique. In the third method, elastic bending theory method, the stresses and strains are calculated from the bending moment and the observed deflections of the beam using elastic bending theory. A comparison is made of the different methods and it is concluded that the differential and direct methods of stress analysis for bending tests give the same shape of stress-strain curves although not identical curves. Stress-strain curves obtained from the elastic bending theory differ in shape from those obtained by the other two methods. Tensile and compressive stresses obtained by the differential method are lower than those obtained by the other two methods because the differential method allows some plastic redistribution of stress. As failure is approached tensile stresses by direct and elastic bending theory are respectively 1.4 and 1.5 times average tensile stress by the differential method. /TRRL/


  • English

Media Info

  • Features: Figures; References;
  • Pagination: p. 586-91
  • Serial:
    • Volume: 25
    • Issue Number: 3
    • Publisher: Thomas Telford Limited
    • ISSN: 0016-8505

Subject/Index Terms

Filing Info

  • Accession Number: 00129990
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM