Flexural excitation in a standard torsional-resonant column device

Giovanni Cascante*, Carlos Santamarina, Najwa Yassir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations

Abstract

The excitation of specimens in multiple modes enhances the characterization of granular materials. The purpose of this paper is to present the equipment modification and test procedure and data reduction for flexural excitation in a standard torsional-resonant column device. Typical results for dry and wet sand specimens are also presented. A salient advantage of the modified device is that it permits testing shear stiffness (torsional excitation) and longitudinal stiffness (flexural excitation) at frequencies which are relevant to high-resolution seismics and near-surface studies (approx. 50-200 Hz). High attenuation in flexural mode is measured in saturated and partially saturated specimens; local flow is suspected as a prevailing loss mechanism. Velocity and damping ratios are complementary indicators of saturation conditions prevailing in the specimen.

Original languageEnglish (US)
Pages (from-to)478-490
Number of pages13
JournalCanadian Geotechnical Journal
Volume35
Issue number3
StatePublished - 1998
Externally publishedYes

Keywords

  • Attenuation
  • Mechanical waves
  • Modal testing
  • Resonant column
  • Sands
  • Velocity

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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