▲ 502 ▼ Video: Baltimore bridge struck by boat and collapses (streamable.com) submitted 2 years ago* (last edited 2 years ago) by Breezy@lemmy.world to c/news@lemmy.world 92 comments fedilink hide all child comments Here is a link to another post with an article. https://lemmy.world/post/13553444
[–] KISSmyOS@feddit.de 21 points 2 years ago (1 child) A container ship like that weighs more than the bridge tower it hit. permalink fedilink source parent hideshow 2 child comments replies: [+] wetnoodle@sopuli.xyz -5 points 2 years ago (4 children) [deleted] permalink fedilink source parent hideshow 8 child comments replies: [–] BraveSirZaphod@kbin.social 26 points 2 years ago (2 children) "Bump" is a galactically humble description of a collision with a container ship weighing nearly 200 million pounds. To illustrate this more cleanly, the momentum of a loaded Boeing 787 flying near top speed is 17,760,000 N.s. For this ship going at just 10 km/h, the momentum is about 260,600,000 N.s. In other words, the bridge would need to be able to sustain the equivalent of 14 9/11 attacks, simultaneously. The way to tolerate incidents like this is to add multiple points of isolated failure so that even if one point is catastrophically destroyed, only a portion of the bridge goes down while the rest remains intact. I don't think there are many, if any, structures on the planet that can withstand that much force permalink fedilink source parent hideshow 4 child comments replies: [–] RubberElectrons@lemmy.world 12 points 2 years ago This right here. You'd need a frankly ridiculous amount of solid stainless steel to build pylons for seaway protection, and that's for low speed impacts. Kinetic energy increases with the square of velocity! I'm not a sailor it anything, but I suppose requiring tugboats for all harbor travel of shops over a gross weight might be a good thing. Makes more jobs, at least. permalink fedilink source parent [–] bbuez@lemmy.world 1 point 2 years ago Also in designing such a resilient bridge, don't forget one of the design requirements is to allow access to a busy shipping port permalink fedilink source parent [+] helenslunch@feddit.nl 16 points 2 years ago* (last edited 2 years ago) [deleted] permalink fedilink source parent [–] Passerby6497@lemmy.world 8 points 2 years ago Saying the bridge was bumped by the cargo ship is like saying someone got bumped in the head after having a brick thrown at them. permalink fedilink source parent [–] newthrowaway20@lemmy.world 5 points 2 years ago That was hardly a bump. permalink fedilink source parent
[+] wetnoodle@sopuli.xyz -5 points 2 years ago (4 children) [deleted] permalink fedilink source parent hideshow 8 child comments replies: [–] BraveSirZaphod@kbin.social 26 points 2 years ago (2 children) "Bump" is a galactically humble description of a collision with a container ship weighing nearly 200 million pounds. To illustrate this more cleanly, the momentum of a loaded Boeing 787 flying near top speed is 17,760,000 N.s. For this ship going at just 10 km/h, the momentum is about 260,600,000 N.s. In other words, the bridge would need to be able to sustain the equivalent of 14 9/11 attacks, simultaneously. The way to tolerate incidents like this is to add multiple points of isolated failure so that even if one point is catastrophically destroyed, only a portion of the bridge goes down while the rest remains intact. I don't think there are many, if any, structures on the planet that can withstand that much force permalink fedilink source parent hideshow 4 child comments replies: [–] RubberElectrons@lemmy.world 12 points 2 years ago This right here. You'd need a frankly ridiculous amount of solid stainless steel to build pylons for seaway protection, and that's for low speed impacts. Kinetic energy increases with the square of velocity! I'm not a sailor it anything, but I suppose requiring tugboats for all harbor travel of shops over a gross weight might be a good thing. Makes more jobs, at least. permalink fedilink source parent [–] bbuez@lemmy.world 1 point 2 years ago Also in designing such a resilient bridge, don't forget one of the design requirements is to allow access to a busy shipping port permalink fedilink source parent [+] helenslunch@feddit.nl 16 points 2 years ago* (last edited 2 years ago) [deleted] permalink fedilink source parent [–] Passerby6497@lemmy.world 8 points 2 years ago Saying the bridge was bumped by the cargo ship is like saying someone got bumped in the head after having a brick thrown at them. permalink fedilink source parent [–] newthrowaway20@lemmy.world 5 points 2 years ago That was hardly a bump. permalink fedilink source parent
[–] BraveSirZaphod@kbin.social 26 points 2 years ago (2 children) "Bump" is a galactically humble description of a collision with a container ship weighing nearly 200 million pounds. To illustrate this more cleanly, the momentum of a loaded Boeing 787 flying near top speed is 17,760,000 N.s. For this ship going at just 10 km/h, the momentum is about 260,600,000 N.s. In other words, the bridge would need to be able to sustain the equivalent of 14 9/11 attacks, simultaneously. The way to tolerate incidents like this is to add multiple points of isolated failure so that even if one point is catastrophically destroyed, only a portion of the bridge goes down while the rest remains intact. I don't think there are many, if any, structures on the planet that can withstand that much force permalink fedilink source parent hideshow 4 child comments replies: [–] RubberElectrons@lemmy.world 12 points 2 years ago This right here. You'd need a frankly ridiculous amount of solid stainless steel to build pylons for seaway protection, and that's for low speed impacts. Kinetic energy increases with the square of velocity! I'm not a sailor it anything, but I suppose requiring tugboats for all harbor travel of shops over a gross weight might be a good thing. Makes more jobs, at least. permalink fedilink source parent [–] bbuez@lemmy.world 1 point 2 years ago Also in designing such a resilient bridge, don't forget one of the design requirements is to allow access to a busy shipping port permalink fedilink source parent
[–] RubberElectrons@lemmy.world 12 points 2 years ago This right here. You'd need a frankly ridiculous amount of solid stainless steel to build pylons for seaway protection, and that's for low speed impacts. Kinetic energy increases with the square of velocity! I'm not a sailor it anything, but I suppose requiring tugboats for all harbor travel of shops over a gross weight might be a good thing. Makes more jobs, at least. permalink fedilink source parent
[–] bbuez@lemmy.world 1 point 2 years ago Also in designing such a resilient bridge, don't forget one of the design requirements is to allow access to a busy shipping port permalink fedilink source parent
[+] helenslunch@feddit.nl 16 points 2 years ago* (last edited 2 years ago) [deleted] permalink fedilink source parent
[–] Passerby6497@lemmy.world 8 points 2 years ago Saying the bridge was bumped by the cargo ship is like saying someone got bumped in the head after having a brick thrown at them. permalink fedilink source parent
[–] newthrowaway20@lemmy.world 5 points 2 years ago That was hardly a bump. permalink fedilink source parent