NUMERICAL ANALYSIS OF RECTANGULAR RAFTS ON LAYERED FOUNDATIONS

The behaviour of perfectly smooth, uniformly loaded rectangular rafts of any rigidity resting on a homogeneous elastic layer which is underlain by a rough rigid base is analysed. Graphical solutions are presented which enable the determination of vertical displacement at the centre, mid-edges and corner of the raft, and the maximum bending moment in the raft. The solutions have been obtained by the finite element method with the interaction between raft and finite soil layer being incorporated through the use of surface elements. A weighting method is presented which allows an approximate isotropic modulus to be derived for a multi-layered soil permitting the solutions to be applied to multi-layered foundations. Variations in raft rigidity and length/breadth ratio and soil layer depth and Poisson's ratio can markedly effect both displacements and bending moments in raft foundations.(a) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00168505
• Corporate Authors:

  Institution of Civil Engineers

  One Great George Street, Westminster
  London,   United Kingdom  SW1P 3AA
• Authors:
  • FRASER, R A
  • Wardle, I J
• Publication Date: 1976-12

Language

• French

Media Info

• Features: Figures; References;
• Pagination: p. 613-630
• Serial:
  • GEOTECHNIQUE
  • Volume: 26
  • Issue Number: 4
  • Publisher: Thomas Telford Limited
  • ISSN: 0016-8505

Subject/Index Terms

• TRT Terms: Bending; Charts; Depth; Dislocation (Geology); Finite element method; Foundations; Mat foundations; Mathematical analysis; Motion; Numerical analysis; Pavement layers; Poisson distributions; Poisson ratio; Slabs; Soils; Stiffness
• Old TRIS Terms: Poissons ratio
• ITRD Terms: 6471: Analysis (math); 6486: Chart; 6499: Depth; 6490: Finite element method; 3377: Foundation; 5483: Movement; 2931: Multicourse; 5924: Poisson's ratio; 3491: Slab; 4156: Soil; 5931: Stiffness
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00149661
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Jun 22 1977 12:00AM