• For full details of graphics available/in preparation, see Menu -> Planners
 لماذا انهار جسر فرانسيس سكوت كي؟ infographic
Graphic shows why entire bridge collapsed when a single pier was hit, and pier protection systems.
GN45642AR

حوادث

لماذا انهار جسر فرانسيس سكوت كي؟

By Phil Bainbridge

March 26, 2024 - جسر فرانسيس سكوت كي، الذي انهار إثر اصطدام سفينة الحاويات MV دالي به أثناء مغادرتها ميناء بالتيمور، شيّد قبل وضع أحدث المعايير لحماية الجسور.

With the world’s third longest continuous truss bridge span, at 366m, the bridge was designed to distribute its load along its entire length, to span longer distances with less material, creating a more efficient structure than if the three spans were all independent of one another. However, this fracture critical design lacks redundancy, meaning that if one span failed, all of them would collapse.

The bridge was completed in 1977, three years before the 1980 collapse of the Sunshine Skyway Bridge which crossed Tampa Bay in Florida, and which led to new regulations for protection of all new bridges, including artificial islands around the piers, “dolphins” - circular
barriers filled with concrete or sand to divert ships and absorb the energy of an impact, and fenders, crushable concrete boxes wrapped around the pier to protect it from impact.

These were not applied to existing bridges however, and while some of them were implemented to a limited degree in Baltimore, they may have been insufficient and would have been unable to deal with a head-on collision from a modern cargo ship like the Dali, which, travelling at just eight knots, could have imparted 1.2 million joules of energy.

Sources
PUBLISHED: 29/03/2024; STORY: Graphic News; PICTURES: Newscom
Advertisement