Seismic Design of the San Francisco - Oakland Bay Bridge Self Anchored Suspension Bridge

摘要

The seismically vulnerable East Span of the San Francisco-Oakland Bay Bridge is being replaced with a dual eastrnbound and west bound 3.6 km long parallel structure. The Bay Bridge lies between the Hayward and the San Andreasrnfaults which can generate magnitude 7.5 M and 8.1 M earthquakes, respectively. Four distinct structures make up thernbridge crossing: a low rise post-tensioned concrete box girder near the Oakland shore; a 2.4 km long segmentalrnconcrete box girder; a self-anchored suspension signature span; and a post-tensioned concrete box girder thatrnconnects to the east portal of the Yerba Buena Island tunnel. This paper focuses on the design parameters andrnconstraints, the design evolution, the bridge type selection process, the selected design’s major structural andrnarchitectural characteristics, and the structural details.