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Why Was The Oakland Bay Bridge So Expensive?
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The San Francisco-Oakland Bay BridgeÂ
More than 27 million cars travel from Yerba Buena Island to Oakland every year. These vehicles are travelling over 3.5km of water because the San Francisco Bay Bridge is 10 lanes wide, which means it can't be neglected. But not all is good news - in 1989 an earthquake caused a lot of problems.
The 6.9 quake that hit San Francisco in 1989 severely damaged the Bay Bridge at the time, so officials had to address structural concerns and make it safe again. Officials considered repairing the bridge but decided that it would be expensive and opted to hold a design contest instead.
The new design took ten years to agree on. They planned to replace the eastern span with a self-anchored suspension bridge, which a panel agreed looked better.
The complexity of this type of bridge proved to be a money sink. The stability rods often broke, meaning they had to spend more on either repairing or refabricating them. They decided to go with guard rails instead of barriers but these would corrode over time. There were a few problems with the construction - the deck was slightly misaligned, which meant it had a higher chance of collapsing during an earthquake. The welding quality also needed work, so we conducted an investigation and undertook some expensive repairs
The Bay Bridge’s eastern span took 11 years to build and it is the most expensive infrastructure project in California so far, but the new high speed train might be more costly.
Total costs of the bridge are unknown but estimates for 2019 are at around 7 billion dollars. This is an increase of over 7 times the original bid of just under 1 billion dollars.
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#Construction #Megaproject #Engineering
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