SEISMIC DESIGN CRITERIA FOR BRIDGES

After the earthquake at San Fernando on February 9, 1971, significant changes were made in structural details of bridges designed by the Division of Structures, California Department of Transportation. New Seismic design criteria were developed that consider both fault proximity and local soil conditions. Response coefficient curves, which are a key element of these new criteria, were developed by determining average elastic response spectra for rock motion and then modifying these spectra to reflect the influence of soil conditions. Considerable engineering judgment was used in assessing ductility and acceptable risk so that the elastic curves could be scaled down to a desirable level for design. Response coefficient curves can be used to find suitable equivalent static force coefficients or as design spectra for use in a dynamic analysis of a response spectrum. The simplified design method is adequate for small structures, but a dynamic analysis is required to accurately predict the response of long, curved structures with intermediate hinges and widely varying column lengths.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1976/579/579-004.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=SEISMIC+DESIGN+CRITERIA+FOR+BRIDGES&author=R.+CASSANO&publication_year=1976
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03611981
• Supplemental Notes:
  • Prepared for the 54th Annual Meeting of the Transportation Research Board. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • CASSANO, R C
• Conference:
  • 54th Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia
  • Date: 1975-1-13 to 1975-1-17
• Publication Date: 1976

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 27-35
• Monograph Title: Earthquake-lnduced Dynamic Response of Bridges and Bridge Measurements
• Serial:
  • Transportation Research Record
  • Issue Number: 579
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Bridge design; Bridges; Design; Ductility; Fault location; Mechanical elasticity; Seismicity; Soils; Structural design
• Uncontrolled Terms: Design criteria; Response spectra; Soil conditions
• Old TRIS Terms: Seismic properties
• Subject Areas: Bridges and other structures; Design; Geotechnology; Highways;

Filing Info

• Accession Number: 00139848
• Record Type: Publication
• ISBN: 0309024935
• Files: TRIS, TRB
• Created Date: Oct 6 1976 12:00AM