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Engineers Analyzing US Bridge Collision Risk

THURSDAY, JUNE 6, 2024


In what is described as an “urgent” assessment, engineers from Johns Hopkins University will study the ship collision risk of major United States bridges, particularly near major ports of entry.

The action is in response to the collapse of the Francis Scott Key Bridge in Baltimore earlier this year, which occurred after a shipping vessel lost power and ran into one of the structure’s supports.

“We need to know now, not five or 10 years from now, whether there is an outsize risk to bridges across the country so that critical investments—which will take years—can begin immediately if they are needed,” said team leader Michael Shields, a Johns Hopkins engineer specializing in risk assessment. “The Key Bridge collapse was a wake-up call.”

Assessment Plans

According to the university, an “army” of students with a National Science Foundation Rapid Response Research grant plans to modernize risk prediction models. Johns Hopkins explains that the nature of shipping, particularly the prominence of massive cargo vessels, has increased “considerably” in the decades since most of these bridges were built.

“Clearly the risk to the Key Bridge was very different in 2024 than it was in 1977 when the bridge opened,” Shields said. “But we don't currently understand that risk.”

The team reportedly hypothesizes that the risk of the Key Bridge collapse was underestimated and that the probability of another catastrophic collision in the United States is likely “much higher” than current design standards presume.

The team will attempt to answer the following questions:

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  • What is the probability that a ship the size of the Dali would stray from its path and collide with the Key Bridge?
  • What are the chances for similar bridge collisions across the country?
  • Have we underestimated the probability of collision and ultimately the probability of failure of critical U.S. bridges?

Engineers plan to mine global shipping data, develop modern risk models and then attempt to identify which critical U.S. bridges are vulnerable to a catastrophic ship collision. Using the shipping data, they will also build models to determine the probability of a ship deviating from course and hitting a bridge in or around major ports.

“Preliminary findings already challenge prevailing assumptions,” said team member Rachel Sangree, a structural engineer and former bridge inspector. “The U.S. has seen 17 incidents of major bridge collapse between 1960 and 2011, averaging one every three years.

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“Between the exponential growth of mega freight ships and the surge in global shipping traffic, many of our bridges simply weren't built to withstand the pressures of today's maritime landscape.”

The findings will reportedly help policymakers prioritize infrastructure improvement spending.

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“The team's findings will be crucial in reassessing and potentially redefining the safety standards for transportation infrastructure,” said structural engineer Ben Schafer, a professor in the Department of Civil and Systems Engineering.

“Given the estimated $1.7 billion to $1.9 billion cost to rebuild the Key Bridge and the potential billions needed to retrofit existing bridges, accurate risk assessment is vital to ensure the sustainability of society's critical infrastructure.”

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The team has started its investigation and hopes to share some preliminary results with stakeholders by the end of the summer. The full study is expected to take approximately one year to complete.

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Tagged categories: Accidents; Bridges; Bridges; Colleges and Universities; Engineers; Health & Safety; Health and safety; Infrastructure; Infrastructure; Port Infrastructure; Program/Project Management; Research and development; Safety; Ships and vessels


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