STRESS-STRAIN INPUT FOR EQUIVALENT-LINEAR ANALYSES

To examine the use of two available stress-strain relations, S&L and H&D, for equivalent-linear analyses, calculations using the computer program SHAKE are performed for a 25-m (82-ft) thick clay deposit subjected to both a strong-intensity and a low-intensity base motion. Despite similarity in surface peak response values, results from these calculations indicate that the frequency response of the site varies significantly with the type of stress-strain relation chosen as well as with the intensity of the input base motion. The example presented in this study is a special case, and the computational results associated with this example are, therefore, by no means conclusive. Nonetheless, the difference in frequency response resulting from using different stress-strain relations can be expected in other situations. The purpose of this note is to caution the practitioner of equivalent-linear analyses to take care in the choice of stress-strain relations used in making seismic response predictions, and it is hoped that the example does serve such a purpose. (Author)

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  • Accession Number: 00302214
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 14798 Tech Note
  • Files: TRIS
  • Created Date: Jan 30 1980 12:00AM