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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. [1]
The NBI can classify bridges as "structurally deficient," which means that the condition of the bridge includes a significant defect, which often means that speed or weight limits must be put on the bridge to ensure safety; a rating of 4 or lower on any of items 58, 59, 60, or 62 (deck, superstructure, substructure, and culverts, respectively ...
Following the collapse, PennDOT ordered reviews of structural adequacy for five other bridges with similar designs to the Fern Hollow Bridge immediately; those five bridges were found to be in "fair" condition at their last inspections. Replacement bridge opened 20 December the same year. Loay-Clarin Bridge Loay, Bohol: Philippines: 28 April 2022
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 ...
Fracture is the appearance of a crack or complete separation of an object or material into two or more pieces under the action of stress.The fracture of a solid usually occurs due to the development of certain displacement discontinuity surfaces within the solid.
A great number of bridges were being designed at that time, and there were insufficient design engineers available to design many bridges as indeterminate structures. [11] Nowadays, through-truss and other fracture-critical designs are avoided in most new bridges for moderate-sized spans.
An example of that is the I-5 Skagit River bridge collapse. The collapse was caused by a truck with an oversize load that was taller than the clearance above of the bridge. The bridge was a steel through-truss bridge with a "fracture-critical" design that has non-redundant load-bearing beams.
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