The discusser observes that five different laboratory cyclic test techniques are currently available to determine dynamic soil properties for seismic ground response analysis: dynamic triaxial compression test, cyclic simple shear test, cylic torsional shear tst, resonant column test, and shake table test. It is almost impossible for each of the laboratory tests to completely duplicate field soil behavior under the controlled environment of the laboratory. It is noted that nonlinear soil models such as Ramberg-Osgood and Martin-Davidenkov have been used to simulate nonlinear seismic ground response and the associated boundary value problems have been solved by the method of characteristics and the finite element method. It has been reported that the visocelastic equivalent linear appoach usually underestimates the high frequency response as compared to those of the nonlinear methods. A modified viscoelastic method can be developed to adjust the dynamic soil properties for each frequency component of the analysis to the strain level developed at the same frequency.

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  • Accession Number: 00193600
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 13597
  • Files: TRIS
  • Created Date: Jun 13 1979 12:00AM