CLOSURE ON FOOTING VIBRATION WITH NONLINEAR SUBGRADE SUPPORT

THE COMMENTS OF HALL ARE VALID IN POINTING OUT THAT ROCKING AND HORIZONTAL MOTION WILL ALWAYS BE COUPLED IN THE PRACTICAL PROBLEM. THE WRITER DID NOT INTEND TO IMPLY THAT THE MODES OF MOTION ARE ALWAYS UNCOUPLED IN THE STATEMENT CONCERNING 4 MODES OF MOTION THAT NEED TO BE CONSIDERED FOR FOUNDATION ANALYSIS. THE WRITERS AGREE WITH HALL THAT THE CURVE FITTING FOR THE DESIGN PROBLEM IS NOT PARTICULARLY DESIRABLE. MOORE'S COMMENTS CONCERNING THE USE OF MODEL TESTING ARE APPRECIATED. THE MASS FACTOR, RATHER THAN THE STRESS, IS KEPT CONSTANT BETWEEN MODEL AND PROTOTYPE. THE FEELING WAS THAT THE NONLINEARITY OF A MATERIAL IS GENERALLY A FUNCTION OF STRESS OR STRAIN LEVEL, AND THAT THE INSTANTANEOUS VALUE OF G IS A FUNCTION OF THE STRESS LEVEL. THE WRITERS COULD NOT DERIVE THE EQUATION PRESENTED BY MOORE. AN EQUATION IS PRESENTED IN WHICH THE FREQUENCIES ARE RESONANT FREQUENCIES DERIVED ON THE BASIS OF THE FORCING FUNCTION'S BEING OF THE ROTATING MASS TYPE REFERENCES: FOOTING VIBRATION WITH NONLINEAR SUBGRADE SUPPORT, N. E. FUNSTION, W. J. HALL, JOURNAL OF THE SOIL MECHANICS AND FOUNDATIONS DIVISION, PROCEEDINGS OF THE AMERICAN SOCIETY OF CIVIL ENGINEERS, PROCEEDINGS PAPER 5458, SEPTEMBER 1967.

  • Supplemental Notes:
    • Vol 94, Sm 6, PP 1384-1385
  • Corporate Authors:

    N/A

    ,   United States 
  • Authors:
    • Funston, N E
    • Hall, W J
  • Publication Date: 0

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  • Accession Number: 00232603
  • Record Type: Publication
  • Report/Paper Numbers: No SM5, Proc Paper 490
  • Files: TRIS
  • Created Date: Aug 15 2004 2:44AM