San Francisco-Oakland Bay Bridge (East)
Cantilever truss bridge
|Function / usage:||
Railroad (railway) bridge
Motorway bridge / freeway bridge
San Francisco, San Francisco County, California, USA
Oakland, Alameda County, California, USA
San Francisco-Oakland Bay Bridge (East) (2013)
Yerba Buena Tunnel (1936)
|Coordinates:||37° 48' 57.00" N 122° 21' 16.00" W|
|main span||427 m|
|12 November 1936||
Opened to traffic.
An inspection reveals cracking in a critical eyebar component of the main span. Found in one of eight bars sharing the same load, the crack was not present two years earlier. The bridge is closed and emergency repairs are carried out.
|27 October 2009||
During the evening commute, a saddle, crossbars, and two tension rods (parts of the emergency repair during the previous month) weighing over 2.25 tons collapses onto the deck. The failure of the repair was caused by two design defects: first, the tie rods closely fit the holes in the cross pieces over the saddles and second, wind caused vibrations in the rods, which in turn caused wear and bending at the through holes, eventually causing a rod fracture. The catastrophic dropping of the cross pieces was caused by a lack of structural attachment to the saddle, being retained only by tack welds, friction and the tension of the tie rods. The rework of the design includes six significant modifications:
|2 November 2009||
The bridge is re-opened after emergency repairs.
Relevant Web Sites
- Bridge design & engineering: Bay Bridge closed after emergency repair fails
- Bridge design & engineering: Bay Bridge reopens after emergency repair
- Bridge design & engineering: Dramatic finale sees Bay Bridge reopen just two hours late
- Bridge design & engineering: Inspection reveals serious crack on Bay Bridge
- Bridge design & engineering: Operation begins to remove 3,200t Bay Bridge section
- Bridgehunter.com: San Francisco Bay Bridge (#33+0025)
- Caltrans: Bay Bridge Photo Archive
- HAER: San Francisco Oakland Bay Bridge, Spanning San Francisco Bay, San Francisco, San Francisco County, CA
- Permanent repair for Bay Bridge crack. In: Bridge Update, n. 88 (December 2009), pp. 1.
- Les ponts de la baie de San Francisco. In: Ossature métallique, v. 5 (June 1936), pp. 269-284. (1936):
- Les grands ponts en construction à San-Francisco. In: Ossature métallique, v. 3 (November 1934), pp. 543-560.
- Le nouveau pont reliant San Francisco à Oakland. In: La Technique des Travaux, v. 11, n. 3 (March 1935), pp. 145-156. (1935):
- Rolling programme. A long weekend closure of San Francisco's Bay Bridge enabled engineers to carry out a dramatic and audacious operation. In: Bridge Design & Engineering, v. 15, n. 57 (4th Quarter 2009), pp. 44-45. (2009):
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