RESPONSE SPECTRA FOR SOFT SOIL SITES

Spectral response characteristics of soft soil sites, illustrated by a set of strong-motion accelerograms from several countries of the Circum-Pacific Belt zone, are studied by regression analyses on magnitude and distance. Pseudovelocity (PSV) response ordinates at 15 values of natural period and 0.05 damping, as well as peak ground acceleration (PGA), velocity (PGV), and displacement (PGD) are considered. It appears that current methods of predicting mean spectral shapes or spectral amplification factors do not account properly for important features of the spectra, such as the dependence and magnitude. As an alternative to the regression approach, reasonable approximations are obtained through random vibration theory with a Kanai-Tajimi power spectral density (PSD) function representing the ground velocity instead of the ground acceleration, as commonly assumed. /Author/

• Supplemental Notes:
  • From Volume I of Earthquake Engineering and Soil Dynamics--Proceedings of the ASCE Geotechnical Engineering Division Specialty Conference, June 19-21, 1978, Pasadena, California. Sponsored by Geotechnical Engineering Division of ASCE in cooperation with: ASCE Technical Council on Lifeline Earthquake Engineering, ASCE Los Angeles Section of their Geotechnical Engineering Group, Earthquake Engineering Research Institute, Soil and Foundation Engineers Association, Structural Engineers Association of Southern California, U.C.L.A. College of Engineering, University of Southern California, and California Institute of Technology.
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Faccioli, E
• Conference:
  • From Volume I of Earthquake Engineering and Soil Dynamics--Proceedings of the ASCE Geotechnical Engineering Division Specialty Conference, June 19-21, 1978, Pasadena, California. Sponsored by Geotechnical Engineering Division of ASCE in cooperation with:
• Publication Date: 1978-6

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 441-456

Subject/Index Terms

• TRT Terms: Dislocation (Geology); Power spectra; Regression analysis; Soft soils; Velocity; Vibration
• Uncontrolled Terms: Response spectra
• Subject Areas: Data and Information Technology; Geotechnology; Highways;

Filing Info

• Accession Number: 00179760
• Record Type: Publication
• Report/Paper Numbers: Proceeding
• Files: TRIS
• Created Date: Oct 12 1978 12:00AM