IMPROVED STRAIN INFLUENCE FACTOR DIAGRAMS

This parametric study which has continued and expanded a previous finite element study, led to three major conclusions: the 1970 concept of a simplified triangular strain factor distribution worked adequately for all cases; the strain factor distributions for plane strain and axisymmetric conditions differed significantly; and increasing the magnitude of the footing pressure increases the peak value of strain factor (I sub zp in the equivalent triangular distribution of I sub z with depth). Details of computer modeling are briefly noted, and sand model tests are described. It is urged that separate strain factor distributions be used for square footings as illustrated by a figure in the paper. It is also urged that peak value of strain factor be increased (in accord with an equation that is presented) as the net footings pressure increases. The factor q sub c must be multiplied by 2.5 for square and 3.5 for long footings to obtain equivalent sand modulus when using the strain factor distributions presented in the paper.

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Filing Info

  • Accession Number: 00184870
  • Record Type: Publication
  • Source Agency: ASCE Journal of the Geotechnical Engineering Div
  • Report/Paper Numbers: Tech Note
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM