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Design Response Spectra for Washington State Bridges

Description: This report presents site-dependent design response spectra which account for the effects of the soils and earthquakes that occur in Washington State. A base spectrum and soil amplification spectra are developed that are correlated with a mapped severity coefficient. The base spectrum is selected with consideration given to the special characteristics of the subduction zone earthquakes likely to occur in this area. The computer program SHAKE is used to develop the soil amplification spectra. Soil profiles from 123 boring logs from actual bridge sites in Washington are used in this research. The results are intended to replace corresponding sections of currently used AASHTO guidelines.

  • Date Published: May, 1989
  • Publication Number: WA-RD 233.1
  • Last Modified: October 2, 2007
  • Authors: George Tsiatas, Richard Fragaszy, Carlton Ho, Karen Kornher.
  • Originator: Washington State Transportation Center (TRAC)
  • # of Pages: 38 p., 630 KB (PDF)
  • Subject: Bridge abutments, Bridges, Computer programs, Earthquake resistant design, Ground settlement, Piles (Supports), Seismicity, Soil stabilization, Soil types, Soils, Stiffness.
  • Keywords: Response spectrum, seismic design, earthquakes, Washington (State)
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This abstract was last modified April 29, 2008