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A fracture critical bridge is a bridge or similar span that is vulnerable to collapse of one or more spans as a result of the failure in tension of a single element. While a fracture critical design is not considered unsafe, it is subject to special inspection requirements that focus on the tension elements of its structure.
Fracture critical designs can leave bridges vulnerable to collisions with ships or large trucks, as in the I-5 Skagit River Bridge collapse in 2013 and the Francis Scott Key Bridge collapse in 2024. Issues and usage
The Key Bridge was “fracture critical,” the National Transportation Safety Board said Wednesday. There is an urgent need to improve or protect old bridges to guard against larger and larger ...
But the Key Bridge is one of 17,468 fracture-critical bridges in the US out of 615,000 total bridges, she said, citing the Federal Highway Administration.
According to a Wall Street Journal analysis of the National Bridge Inventory, there are eight U.S. bridges that are fracture critical (a condition flagged by the NTSB in its investigation) and have similar vertical clearance as the Francis Scott Key Bridge: the Tacoma Narrows Bridge, the Lewis and Clark Bridge over the Columbia River, the St ...
Bridges such as the one in Baltimore are classified as "fracture critical" by the federal government - meaning that if one portion of the bridge collapses, it's likely to take down the rest of the ...
The bridge as seen while driving southbound, showing its curved trusswork. This photo was taken two weeks before the collapse. This steel through-truss bridge had a "fracture-critical" design with non-redundant load-bearing beams and joints that were each essential to the whole structure staying intact. An initial failure (perhaps by cracking ...
A Department of Transportation inspector who failed to note a crack in a bridge over the Mississippi River, between Arkansas and Tennessee, was fired Monday for the “unacceptable” transgression.