2/7/2012

The $6 billion-plus San Francisco-Oakland Bay Bridge in California is meant to last 150 years and make it through an earthquake with minimal damage. Engineers built the concrete piers of the bridge so they would sway in a quake and damage would be limited to places that had extra steel reinforcing. The suspension bridge tower is held up by four steel shafts that can sway and are connected by shock-absorbing shear links.

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