Saturday, September 11, 2021 (event starts at 7:00 AM San Francisco Local Time)
The New East Span of the San Francisco – Oakland Bay Bridge: A Community’s Passion for Innovation & Aesthetics
A section of the eastern span of the San Francisco–Oakland Bay Bridge, originally built in 1936, collapsed during the Loma Prieta earthquake on October 17, 1989. The damaged span of the Oakland side of the Bay Bridge was replaced with a new self-anchored suspension bridge (SAS) and a pair of viaducts.
The New East Span of the San Francisco–Oakland Bay Bridge, completed in 2013, is 10,176 ft (3,102 m) long with 10 travel lanes and carries more than 260,000 vehicles every day, a vital mobility link between San Francisco and Oakland. The East Span includes a separate bicycle and pedestrian pathway. It is the longest span bridge in its class as a single tower, self-anchored suspension bridge in a seismic zone. An Iconic bridge design with a modernistic look represents the San Francisco Bay areas’ passion for innovation & aesthetics. It is an example of engineering ingenuity as its design, fabrication, and erection were challenging due to its three-dimensional cable erection with sloping hangers to support the orthotropic steel deck eliminating massive gravity anchors thereby minimizing its footprint on the Bay.
- Read Structure Magazine article by M Nadar & B Maroney
- Read design and construction of the bridge, an article by Tom Ho
- Watch youtube video – seismic simulation of the bridge
- Book – Remaking the San Francisco- Oakland Bay Bridge – K. Trapenberg Frick
Speaker: Ajay Sehgal, PE (Civil)
Mr. Ajay Sehgal was a Senior Bridge Engineer, in the Office of Structure Construction (Bridge Dept.) at the California Department of Transportation (Caltrans) during the time when the New East Span of the Bay Bridge was being built. He is currently Branch Chief in District 04 (San Francisco Bay Area) Encroachment Permits. Mr. Sehgal started at Caltrans 33 years ago in 1988 when he worked on the Schuyler Heim vertical draw bridge in Los Angeles. In 1995, he worked on the seismic retrofit of the Presidio Viaduct in San Francisco, southern approach to the Golden Gate Bridge. In 1996 he continued to work in San Francisco on the interim seismic retrofit of the eastern approach of the Bay Bridge. In 2008, he worked on the new Self-Anchored Suspension Bay Bridge. He went to China, and later to South Korea, on special assignments related to the inspection of the shear keys and bearings of the Self-Anchored Suspension portion of the Bay Bridge. Mr. Sehgal provided guidance in the design & construction of falsework, scaffolding, bridge trestles, trenching, shoring, and demolition. Mr. Sehgal has also worked on multiple rehabilitation & emergency projects on long-span toll bridges in the San Francisco Bay Area and Southern California.
Mr. Sehgal holds a bachelor’s degree in Civil Engineering from Thapar Institute of Engineering and Technology. He is a Professional Civil Engineer registered in California and an active member of the American Society of Civil Engineers (ASCE). He was a co-chair of the 2013 and 2019 International Orthotropic Bridge Conferences (OBG). He was a keynote speaker and presenter at the Fourth OBG in Tianjin, China in 2015.