A RHEOLOGIC INVESTIGATION OF THE DYNAMIC RESPONSE SPECTRA OF SOILS. ENERGY DISSIPATION RESPONSE OF A COHESIVE SOIL

THE RESULTS OF AN INVESTIGATION OF THE ENERGY DISSIPATION PROPERTIES OF A COHESIVE SOIL ARE PRESENTED. MAJOR EMPHASIS IS DIRECTED AT ENERGY DISSIPATION AS WELL AS PHENOMENA ASSOCIATED WITH ENERGY DISSIPATION. SOIL RESPONSE IS REPRESENTED IN TERMS OF VISCOELASTIC PARAMETERS. BOTH DIRECT AND INDIRECT METHODS OF DETERMINING ENERGY DISSIPATIONS ARE CONSIDERED. DAMPING CAPACITY AS A FUNCTION OF FREQUENCY IS DETERMINED DIRECTLY BY MEASURING THE PHASE ANGLE, BETWEEN APPLIED AND RESULTING WAVEFORMS IN UNIAXIAL /UNCONFINED/ COMPRESSION WITH CONTROLLED SINUSOIDAL VIBRATION. THE RESULTS ARE GIVEN IN TERMS OF THE LOSS TANGENT, TANGENT OF THE PHASE ANGLE. THE LOSS TANGENT IS DEPENDENT ON MOISTURE CONTENT, FREQUENCY, AND AMPLITUDE OF DYNAMIC STRESS-STRAIN, BUT SPECIMEN GEOMETRY AND STATIC STRESS LEVEL, WITHIN THE RANGE CONSIDERED SEEM TO HAVE DEFINITE EFFECT ON THE RESULTS. THE EXPERIMENTAL RESPONSE IS DEFINITELY NONLINEAR. ENERGY DISSIPATION IS ALSO OBTAINED BY INDIRECT METHODS THROUGH THE APPLICATION OF FOURIER TRANSFORMATION TECHNIQUES TO EXPERIMENTAL DATA OBTAINED FROM CREEP AND STRESS RELAXATION TESTS. SUCH TRANSFORMATIONS ARE MADE USING PIECE- WISE CONTINUOUS APPROXIMATIONS OF THE CREEP AND RELAXATION RESPONSE IN ASSOCIATION WITH DIGITAL COMPUTER TECHNIQUES. THE LOSS TANGENT RELATIONS OBTAINED USING THE FOURIER TRANSFORMS ARE COMPARABLE TO THOSE OBTAINED BY THE DIRECT STRESS-STRAIN-PHASE ANGLE METHOD. A REVIEW OF PREVIOUS STUDIES ON WAVE PROPAGATION AND ATTENUATION AS WELL AS THE ELECTRICAL ANALOG TO RHEOLOGIC SYSTEMS IS ALSO GIVEN. /AUTHOR/

  • Supplemental Notes:
    • Report 3, 248 PP, 67 FIG, 4 TAB, 181 REF, 1 APP
  • Corporate Authors:

    Northwestern University, Evanston

    Technological Institute, 1801 Maple Street
    Evanston, IL  United States  60201
  • Authors:
    • Kondner, R L
    • Ho, MMK
  • Publication Date: 1964-6

Subject/Index Terms

Filing Info

  • Accession Number: 00233965
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 23 1994 12:00AM