California's Seismic Design Criteria for Bridges

by James H. Gates, (M.ASCE), Sr. Bridge Engr.; California Dept. of Transportation, Sacramento, Calif.,


Serial Information: Journal of the Structural Division, 1976, Vol. 102, Issue 12, Pg. 2301-2313


Document Type: Journal Paper

Discussion: Mao Felix Y. (See full record)
Closure: (See full record)

Abstract: An earthquake design criteria developed for bridges in California is presented. The criteria considers the proximity of maximum credible seismic events, local soil conditions, dynamic structural characteristics, ductility, and risk. The rationale for development of a flexible criteria which permits future revisions is given. The development of a map of maximum bedrock accelerations for California is examined. The development of response spectra at the bedrock level based on actual recorded events is presented. A method for considering the effects of soils at a site is developed and incorporated into the criteria. Four sets of soil curves are shown to represent the majority of bridge sites in California. The rationale behind the ductility and risk reductions for modern California bridges is described. Recent dynamic analysis applications and approximate methods of analysis are presented, as well as future directions of seismic bridge design.

Subject Headings: Bridge design | Seismic design | Seismic tests | Soil dynamics | Bedrock | Risk management | Ductility | Bridges | North America | California | United States

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