Seismic Design Philosophies and Performance-Based Design Criteria Introduction Design Philosophies No-Collapse-Based Design • Performance-Based Design 37 No-Collapse-Based Design Approaches AASHTO-LRFD Specifications • Caltrans Bridge Design Specifications Lian Duan California Department of Transportation Performance-Based Design Approaches Caltrans Practice • New Caltrans Seismic Design Polices • ATC Recommendations Sample Performance-Based Criteria Determination of Demands • Determination of Capacities • Performance Acceptance Criteria • Acceptable Force D/C Ratios and Limiting Values for Structural Members Fang Li California Department of Transportation. | Li F. Duan L. Seismic Design Philosophies and Performance-Based Design Criteria. Bridge Engineering Handbook. Ed. Wai-Fah Chen and Lian Duan Boca Raton CRC Press 2000 37 Seismic Design Philosophies and Performance-Based Design Criteria Introduction Design Philosophies No-Collapse-Based Design Performance-Based Design No-Collapse-Based Design Approaches AASHTO-LRFD Specifications Caltrans Bridge Design Specifications Performance-Based Design Approaches Lian Duan California Department of Transportation Caltrans Practice New Caltrans Seismic Design Polices ATC Recommendations Sample Performance-Based Criteria Fang Li California Department of Transportation Determination of Demands Determination of Capacities Performance Acceptance Criteria Acceptable Force D C Ratios and Limiting Values for Structural Members Summary Introduction Seismic design criteria for highway bridges have been improving and advancing based on research findings and lessons learned from past earthquakes. In the United States prior to the 1971 San Fernando earthquake the seismic design of highway bridges was partially based on lateral force requirements for buildings. Lateral loads were considered as levels of 2 to 6 of dead loads. In 1973 the California Department of Transportation Caltrans developed new seismic design criteria related to site seismic response of the soils at the site and the dynamic characteristics of bridges. The American Association of State Highway and Transportation Officials AASHTO modified the Caltrans 1973 Provisions slightly and adopted Interim Specifications. The Applied Technology Council ATC developed guidelines ATC-6 1 for seismic design of bridges in 1981. AASHTO adopted ATC-6 1 as the Guide Specifications in 1983 and later incorporated it into the Standard Specifications for Highway Bridges in 1991. 2000 by CRC Press LLC Since the 1989 Loma Prieta earthquake in California 2 extensive research 3-15 has been conducted on seismic .
