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/

Media Info

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

Subject/Index Terms

Filing Info

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