4 ms·

This, 100%. I forget the specific numbers but regardless, the kinetic energy of a thing with that much mass, even moving at a very slow speed, is off the charts

by capyba 10mo ago

This, 100%. I forget the specific numbers but regardless, the kinetic energy of a thing with that much mass, even moving at a very slow speed, is off the charts. Designing a bridge or protections for a bridge to survive that would at a minimum be cost prohibitive, if even possible with today’s materials and construction technologies.

sitkack 10mo ago
Doesn't mean that nothing can be done. https://www.ntsb.gov/news/press-releases/Pages/nr20250320.aspx https://www.ntsb.gov/news/press-releases/Pages/nr20250320.as... > The NTSB found that the Key Bridge, which collapsed after being struck by the containership Dali on March 26, 2024, was almost 30 times above the acceptable risk threshold for critical or essential bridges, according to guidance established by the American Association of State Highway and Transportation Officials, or AASHTO. > Over the last year, the NTSB identified 68 bridges that were designed before the AASHTO guidance was established — like the Key Bridge — that do not have a current vulnerability assessment. The recommendations are issued to bridge owners to calculate the annual frequency of collapse for their bridges using AASHTO’s Method II calculation. Letters to the 30 bridge owners and their responses https://data.ntsb.gov/carol-main-public/sr-details/H-25-003 https://data.ntsb.gov/carol-main-public/sr-details/H-25-003
- deleted 10mo ago
  [deleted]
- throwaway173738 10mo ago
  This is essentially the same thing that happened with Fukushima Daiichi. The organization running it failed to respond to new information.
potato3732842 10mo ago
Energy doesn't mean squat without a time component over which it's dissipated. Stopping a car normally vs crashing a car. Skydiving with a parachute vs skydiving without a parachute. For something like ship vs bridge you have to account for the crunch factor. USS Iowa going the same speed probably would've hit way harder despite having ~1/3 the tonnage.

by capyba 10mo ago

sitkack 10mo ago

Doesn't mean that nothing can be done. https://www.ntsb.gov/news/press-releases/Pages/nr20250320.aspx https://www.ntsb.gov/news/press-releases/Pages/nr20250320.as... > The NTSB found that the Key Bridge, which collapsed after being struck by the containership Dali on March 26, 2024, was almost 30 times above the acceptable risk threshold for critical or essential bridges, according to guidance established by the American Association of State Highway and Transportation Officials, or AASHTO. > Over the last year, the NTSB identified 68 bridges that were designed before the AASHTO guidance was established — like the Key Bridge — that do not have a current vulnerability assessment. The recommendations are issued to bridge owners to calculate the annual frequency of collapse for their bridges using AASHTO’s Method II calculation. Letters to the 30 bridge owners and their responses https://data.ntsb.gov/carol-main-public/sr-details/H-25-003 https://data.ntsb.gov/carol-main-public/sr-details/H-25-003

deleted 10mo ago
[deleted]
throwaway173738 10mo ago
This is essentially the same thing that happened with Fukushima Daiichi. The organization running it failed to respond to new information.

potato3732842 10mo ago

Energy doesn't mean squat without a time component over which it's dissipated. Stopping a car normally vs crashing a car. Skydiving with a parachute vs skydiving without a parachute. For something like ship vs bridge you have to account for the crunch factor. USS Iowa going the same speed probably would've hit way harder despite having ~1/3 the tonnage.