SEISMIC ASSESSMENT AND RETROFIT OF THE SAN FRANCISCO-OAKLAND BAY BRIDGE WEST CROSSING FOUNDATIONS

This paper describes the analysis and design of the seismic retrofit of the foundations of the West Crossing of the San Francisco-Oakland Bay Bridge (SFOBB). Excluding the end anchorages, there are six major foundations supporting the West Crossing. Four of these foundations are hollow section caisson foundations, and the other two are cast-in-place solid concrete piers. Seismic analysis of the SFOBB suspension bridges has shown that the four caisson foundations are not vulnerable to extensive damage during the Safety Evaluation Earthquake and can be expected to remain serviceable following such an event. However, the two cast-in-place concrete piers will require retrofitting due to their lack of adequate reinforcement. Also, the concrete pedestals supporting the steel towers at the tops of the caissons are deficient in both moment and shear and require retrofitting. A description of the bridge foundations and a discussion of the analysis tools and techniques used to assess their seismic behavior is presented, as well as proposed retrofit measures.

• Supplemental Notes:
  • In the proceedings, this paper appears twice, on pages 556-568 and on pages 585-597.
• Corporate Authors:

  California Department of Transportation

  1120 N Street
  Sacramento, CA  United States  95814
• Authors:
  • Reno, M
  • Simmons, R
  • Duan, Liwei
  • Akkari, M
• Conference:
  • Second National Seismic Conference on Bridges and Highways
  • Location: Sacramento, California
  • Date: 1997-7-8 to 1997-7-11
• Publication Date: 1997

Language

• English

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 556-568

Subject/Index Terms

• TRT Terms: Bridge foundations; Bridge piers; Caissons; Earthquake resistant design; Retrofitting; Suspension bridges
• Identifier Terms: San Francisco-Oakland Bay Bridge
• Uncontrolled Terms: Concrete pedestals; Seismic vulnerability
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00760124
• Record Type: Publication
• Files: TRIS, STATEDOT
• Created Date: Feb 3 1999 12:00AM