Baltimore's Francis Scott Key bridge disaster has highlighted a common structural vulnerability in thousands of American bridges.
The collapsed Francis Scott Key Bridge lay on top of the container ship Dali, Monday, April 15, 2024, in Baltimore . The FBI confirmed that agents were aboard the Dali conducting court-authorized law enforcement activity. Baltimore ’s Francis Scott Key bridge disaster has highlighted a common structural vulnerability in thousands of American bridges. More than 17,000 bridges lack structural redundancy , just as the Francis Scott Key Bridge did.
“That would likely cause a portion of or the entire bridge to collapse. There’s no redundancy,” NTSB Chair Jennifer Homendy said.Fracture critical bridges, those built without structural redundancy, are scattered throughout the country. Most were built between the 1950s and 1970s as the U.S. completed its interstate highway system.
“When you’re designing new bridges you may make the piers robust enough that they can take a hit,” bridge and structural engineer Andy Herrmann said.
Fracture Critical Structural Redundancy Key Bridge NTSB Baltimore Collapse Protection
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