A NOTE ON THE COMPUTER ANALYSIS OF FOUNDATION RAFTS RESTING ON PLASTIC SOILS: A TECHNICAL NOTE

THE PAPER DISCUSSES THE PROBLEM OF THE DESIGN OF RAFTS RESTING ON SOFT SUBGRADES, IN WHICH LONG-TERM DEFORMATIONS LEAD TO A REDISTRIBUTION OF REACTIONS. DESIGN MOMENTS AND SHEARS ARE CALCULATED BY ASSUMING A UNIFORM UPTHRUST, AND IT IS USUAL TO ANALYZE AN INVERTED RAFT ON COLUMN SUPPORTS SUBJECTED TO A UNIFORMLY DISTRIBUTED LOADING. ERRORS INHERENT IN SUCH AN APPROACH ARE DISCUSSED, AND AN ALTERNATIVE METHOD IS SUGGESTED. THIS ASSUMES AN ELASTIC SUBGRADE COMPOSED OF VERY SOFT SPRINGS GIVING PROMINENCE TO RAFT STIFFNESS AND ENSURING UNIFORM DISTRIBUTION OF UPTHRUST. THE METHOD AUTOMATICALLY SATISFIES LOCAL AND OVERALL EQUILIBRIUM. A COMPARISON OF THE TWO APPROACHES ON A RAFT ANALYZED BY THE AUTHOR FOR CONSULTING ENGINEERS DEMONSTRATES THE DIFFERENCES IN DESIGN MOMENTS PREDICTED BY THE TWO METHODS /AUTHOR/

Media Info

  • Features: Figures; References;
  • Pagination: p. 171-4
  • Serial:
    • Structural Engineer
    • Volume: 0
    • Issue Number: 4
    • Publisher: Institution of Structural Engineers
    • ISSN: 1466-5123

Subject/Index Terms

Filing Info

  • Accession Number: 00236944
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Feb 11 1973 12:00AM