San Francisco–Oakland Bay Bridge East Span Replacement
Design JV: Moffatt & Nichol and TY Lin
Contractor: American Bridge/Flour for Self-Anchored Suspension Span and Kiewit/Flatiron/Manson for Skyway Bridge and MCM Construction for Yerba Buena Island Transition Structure
The project was initiated by the collapse of one span during the 1989 Loma Prieta Earthquake. It was decided to replace the bridge after Caltrans determined it was not viable nor cost-effective to perform a seismic retrofit on a 70-year-old bridge. The eastern spans of the 2.2-mile (3.54km)-long, San Francisco–Oakland Bay Bridge, connects Oakland to Yerba Buena Island in San Francisco Bay. The bridge is a critical life-line structure and was designed to withstand a M8.0 earthquake from the nearby San Andreas fault.
It took the design team four years to design the new bridge and 11 years to construct at a cost of $6.3 billion. The bridge opened to traffic on Labor Day 2013. It carries more than 280,000 vehicles per day between San Francisco and the East Bay communities, which makes it one of the busiest bridges in the North America.
The main bridge was designed as a single-tower, self-anchored suspension bridge with a 1,263-foot-long main span and a 590-foot (180-meter)-long back span. Both the 530-foot (162-meter)-tall single-tower and self-anchored features of the suspension span represent first-of-their-kind innovations in bridge design. A pair of viaducts called the “Skyway,” constructed from precast concrete box segments with 340-foot (104-meter) spans, completes the remaining 1.5-mile (2.41 km) connection.
Mr. Komar’s Involvement: • construction stage analysis, • camber and erection control from YBI Transition Structures to Self-Anchored Suspension Bridge, • fast-track new design of the SAS Pier E2 shear keys, • On Site Construction Support