A recently released report from the UW details the potential impact on bridges if a magnitude 9 earthquake should happen to shake Western Washington.
The southbound First Avenue South Bridge in South Seattle will have lane closures starting Friday, March 5, 2021.A recently released report from the University of Washington, sponsored by the Washington Department of Transportation, details the potential impact on bridges if a magnitude 9 earthquake should happen to shake Western Washington.
Models were developed to evaluate the impacts on Washington bridges that were built before 1976 and others that were built between 1976 and 2018. The models then experienced ground motions from 30 simulated earthquakes and, as expected, older bridges did not fare well. Bridges nearest to the Cascadia Subduction Zone sustained widespread damage, with a likelihood of buckling ranging from 10% to 30% and columns breaking into fragments of rock ranging from 35% to 70%.About 68% of the bridges were supported with at least one reinforcement, while another 12% had single spans.
The 182-page report also suggests the provided data could be used to prioritize retrofitting efforts.
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