Seismic bridge design has been evolving based on research findings and lessons leamed from
past carthquakes. Since the 1994 Northndge earthquake, Caltrans has been shifting toward a
displacement-based design approach emphasizing capacity design. In July 1999, Caltrans published a
performance-based single comprehensive document, the Caltrans Seismic Design Criteria, Version 1.1,
which focused mainly on typical new concrete bridges.In September 1999, a Structural Steel
Committee Task Group was formed to develop the seismic design criteria for steel bridges.
The provisions presented in the Guide Specifications for Seismic Design of Steel Bridges (Guide)
are based on past successful experiences, various codes and specifications, state-of-the-art research and
knowledge.The Guide has passed through five successive drafts and critical reviews since January
2000. It has been developed as a consensus document to provide a uniform guideline for the scismic
design of the steel bridges.The Guide is supplemental to the current Caltrans SDC (Version 1.2
December 2001) and shall be applied in conjunction with the current Caltrans Bridge Design
Specifications (LFD Version April 2000).
The Guide is presented in a side-by-side column format with the specification text placed in the
left column and the corresponding commentary text printed in the right column. The Guide consists of
seven chapters and six appendices. The Commentary and Appendices to this Guide are integral parts of
the Guide. They are prepared to provide background information conceming the development of the
Guide.
The development of the first edition of the Guide was a joint team effort product of the Structural
Steel Committee, the Earthquake Engineering Committee, and included many people who gave
unselfishly of their time and talent. This effort is gratefully acknowledged. Following is recognition of
those individuals who have been instrumental in producing this document.
Task Group - Substantial Contribution:
Lian Duan, Steve Altman, Martin Pohll and Kevin Harper.
Internal Comment and Review：
Mohamed Akkan,Jess Avila,Allan Chow,Al Christensen,Joe Downing,Mahmoud Fustok,Susan
Hida, Mike Keever, Mark Mahan, Tom Ostrom, Shannon Post, Li-Hong Shen, Eugene Thimmhardy
and Checfong Yang.
External Comment and Review:
Michel Bruneau,State University of New York at Buffalo;Ahmad Itani,University of Nevada at
Reno; M. Myint Lwin, Federal Highway Administration; Mark Reno,Quincy Engineering; Chuck
Seim, TY Lin International; Shawn Sun, Califomia Department of General Services; Shouji Toma,
Hokkai-Gakuen University, Japan; and Chia-Ming Uang, University of Califomia at San Diego.
Figures and Drawings: Fangfei Chen

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