Leopards, faces, etc
If I remember correctly the oldest still standing bridge is like 4000 year old!
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'ΩÏα
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I didnât watch it. Maybe someone else can make the sacrifice?
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I was surprised when I watched the original video again and realized we were seeing the front of the boat not the back when it hit the bridge. Going to take some tricky metal cutting to get the bridge off of that boat without killing anyone.
As long as its the # of views that brings in the money, which leads to everyone finding a way to get them, conspiracy theories will be a part of everything.
I have no idea what that is, but it looks like itâs saying ânah dawgâ
Iâd be really annoyed if my new car on the way was in one of those shipping containers.
Only if you were going to pick it up in Sri Lanka.
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Most autos are handled as a bulk cargo, not containerized. One of the biggest automotive terminals happens to be just inside of the bridge, however, so a ton of cars will be delayed as a result of this.
Iâm back with more books recs. If you want to learn about building bridges you should read The Great Bridge by David McCullough. It tells the history of the construction of the Brooklyn Bridge, which was very troubled. The original engineer died after stepping on a nail. His son then took over and got some weird debilitating illness after getting the bends from going down in the underwater pilling structures, and his wife ended up overseeing the rest of the project.
https://twitter.com/RelegatedToShit/status/1773470117931979131
Aha! We finally have a convincing motive for the bridge false flag op.
NYT got you bro
The container ship Dali appeared to move sluggishly before striking the Francis Scott Key Bridge in Baltimore on Tuesday. Yet it delivered a force so large that one reasonable comparison is to a rocket launch.
How could something traveling slower than a casual bike rider cause such a devastating impact? The answer lies in its mass: roughly a third to a half of the Empire State Building.
Our lowest estimate of how much force it would take to slow the Dali, if it were fully loaded, is around 12 million newtons, about a third of the force it took to launch the Saturn V rocket for the Apollo moon missions.
And our higher-end estimates, reviewed by several civil engineering experts, suggest it is realistic to put the force of the impact with the pier at upward of 100 million newtons.
Experts disagreed on whether it was reasonable for any bridge pier to withstand a direct collision with a massive container ship.
âDepending on the size of the container ship, the bridge doesnât have any chance,â said Nii Attoh-Okine, a professor of engineering at the University of Maryland. He said that Baltimoreâs Key Bridge had been performing perfectly before this accident occurred, and that he thought 95 to 99 percent of bridges would be damaged if such a container ship were to strike them.
But Sherif El-Tawil, an engineering professor at the University of Michigan who reviewed our calculations, said it was feasible to design a pier that would stay standing after such an impact. âIf this bridge had been designed to current standards, it would have survived.â
Modern bridges, designed in the age of âultralargeâ shipping containers, are typically built with stronger piers or protection systems around the piers that can either absorb or deflect the force of ship collisions.
But the Key Bridge was completed in 1977, when standards were different and ships were far smaller
Force of Ship Collision Was on the Scale of a Rocket Launch Shipâs Force in Baltimore Bridge Collapse Was On the Scale of a Rocket Launch - The New York Times
Did it have its gas dumped and now itâs no longer applying the force it was? Or is it still applying significant force to the broken bridge? Is the solution offloading all of it before doing anything else? What is the process for cleaning this up somewhat safely?
We can check this. If the shipâs mass is m= 75E6 Kg (we donât know exactly but copilot tells me loaded it should be 70 to 85% of its âgross tonnageâ, 95,000), it was moving at v= 4 m/s (8 knots, from news reports), and came to a stop in about d=50 m (from pictures, the ship came to rest in a distance about equal to its width), I get an average force= change in kinetic energy/distance=1/2mv^2/d= 12E6 N. Youâll have to trust me I didnât cheat, but thatâs the same number they got. Anyway, you can also do it using impulse-momentum and get a very similar number.
It wouldnât be constant though, and the maximum force, on the initial impact, would be a lot higher. Ten times more doesnât seem unreasonable.
But if you want to impress people, maybe tell them the energy dissipated in the collision is equivalent to whatâs in about 300 lbs of TNT.
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Population of Philadelphia was 300k higher in 1922 than it is today.
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Thatâs a pretty interesting fact that I feel like I should have known but did not.
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Chicago is even crazier. Down 1 million people since 1950, same population now as 1920. Baltimore, Cleveland and Detroit down hundreds of thousands from the early/mid 1900s.
Many urban areas in the south and west have grown and most of the large northern cities are flat or down.
Thatâs a bit misleading. Chicago metro has grown by over 4 million since 1950. Most midwestern and Northeast cities are hemmed in by suburban municipalities and havenât spatially expanded since the early 20th century (also most of them have paved over residential neighborhoods to create highways to get people to those suburbs). Sunbelt cities tend to just annex the periphery as desired.