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A beam broke and the entire bridge was destroyed. The two bridges in New York were similar in structure to the Key Bridge.

After the Francis Scott Key Bridge over Baltimore Harbor collapsed last month after being struck by an out-of-control freighter, the National Transportation Safety Board (NTSB) reported that a type of safety device used on the Key Bridge was designed to be “fracture critical.” “It is said. “The design structure is also widely used in the United StatesNew York CityThe main routes of transportation are the George Washington Bridge and the Verrazzano-Narrows. Under this structure, as long as one of the steel members bearing tensile force is damaged, the entire bridge may collapse.

However, the NTSB reported after the accident that it was the vertical support pillars that struck the ship that caused the bridge to collapse. However, the risk and prevalence of “severe ruptures” are still a cause for concern. NTSB Chairman Jennifer Homendy said that more than 17,000 bridges in the United States now use this design structure.

Professionals said that “severe fracture” does not mean that the bridge itself is unsafe, but that such a design lacks ultimate stress redundancy. Once it is not maintained properly or a small accident occurs, it can have serious consequences. In addition to the two bridges in New York, this structure is also used in many iconic giant bridges across the United States , which includesan franciscoGolden Gate Bridge and Chesapeake Bay Bridge in the Greater Washington area, etc. By law, bridges using “fracture-critical” designs must be noted in inspection records and undergo special inspection of critical load-bearing components regularly, sometimes even annually.

However, somewhat reassuringly, the two bridges in New York are suspension bridges, and their piers are close to shore, unlike the Key Bridge, which is located in the middle of the water and close to the waterway, so there is less possibility of a ship passing through. The intensity of collision is slightly less. New York City officials also assured the public after the Key Bridge disaster that 14 bridges in the five boroughs were being closely monitored and appropriate preventive measures were in place to avoid recurrence of similar accidents.

In the 1990s, the federal government issued safety regulations requiring the installation of “dolphins”, “fenders”, and other independent barriers around bridges to prevent collisions with moving vessels. However, as commercial ships grow larger in size, the old rules can no longer hold back today’s giant ships. For example, the draft of the freighter responsible for the Key Bridge accident reached thousands of tons. Professionals believe that no bridge can withstand its impact.

and “according to”wall StreetDaly pointed out that since the Panama Canal was widened in 2016, more and more giant bulk or container ships departing from Asia have headed directly to ports on the East Coast of the United States, eliminating the need for eastern ports or relatively old infrastructure. There are problems for structural bridges. Security Risk.

Somewhat reassuringly, most of New York’s bridges are suspension bridges, with abutments close to the shore and large spans, so the risk of collision with an out-of-control ship is low. The picture is of the Verrazzano Bridge. (Reporter Ju Junda/Photography)

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