Posted on 03/18/2018 4:58:46 PM PDT by Roman_War_Criminal
Some spectacularly-high aqueducts in Portugal.
≡≡8-O
Some people are so stupid they don’t know enough to even ask the right questions
The pylon and suspension cables are the things that keep it from COLLAPSING
they are not there to make it look pretty, or for decoration.
There is a special kind of stupid that occurs in Miami construction, we get it built, but usually have to do it twice.
Read a book on the Eads bridge in St Louis, and has a lot of other interesting info
Rising Tide: The Great Mississippi Flood of 1927 and How it Changed America
I’ve built several 25 story and up post tension highrises
The cables or tendons are very different than bridge suspension cables and serve a different purpose.
The tendons in a post tension slab are there to reduce the amount of reinforcing steel necessary. They are pulled tight after the concrete in the slab has reached a specified strength, usually 75% of the 28 day design strength.
I’m thinking they were tensoning cables, not doing a “stress test” whatever the hell that is, because we never did them, or were required to.
If they were pulling cables that could mean the concrete slab was not even up to full strength.
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There you go. Complete explanation in the story. The dummies didn't bother to install the supporting cables and center support.
Accident that was waiting to happen. Equal opportunity engineering, Obama style!
I understand. You are showing pictures of technology, engineering, materials science, that were all developed in the western world.
All of the technolgy was invented, developed, and first used in the western world, mainly European.
I would assume on paper, the span was designed to support itself unloaded. It seems to me if the stability of the span came into question or just tinkering with the stability, they should have shut down the road. The end result looks like they were alpha testing their product on the general public.
Thanks for presenting an angle I didn’t think of: that the cables (whether all or some) weren’t tensioned AT ALL before the span was placed.
I’ve read a bit, and understand that the tendons are tensioned while the concrete is partially cured.
And, I could understand hypothetically that they might have been checking the cable tension, and/or possibly bringing it up to spec. Maybe an anchor pulled.
But, if they were tensioning the cables for the first time after placing the span, that strikes me as truly idiotic. Without tensioning before elevation, you’d essentially have a long concrete, weak, partially cured span with inadequate reinforcement and no tension. Who would authorize that?
Perhaps the construction technique of tensioning after installation (if that’s what happened) should get its own acronym. I suggest changing ABC to mean “Accelerated Bridge Collapse.”
That's Miami construction in a nutshell.
Sweat the details and miss the big picture entirely.
...Bridges that withstand “100 + years of services life”. Not even close, Jagoff...
It sure as heck ain’t in Africa, is it?
Nope, but the Pyramids are, and they are even older. How did the Africans get those huge blocks of solid rock so high to build the pyramids?
Arabs are not Africans. They are Semites.
Egypt is in Africa, not Arabia.
Regardless, neither the Chinese or the Egyptians built magnificent structures without any help from the Western World.
neither the Chinese or the Egyptians built magnificent structures without any help from the Western World.””
I was referring to blacks, not Semites, not Chinese, not other Asians.. I’m well aware of the Great Wall, the pyramids, and the Taj Mahal. I have done several research projects with Chinese, Koreans, and Asian Indians, all of which were good scientists. So, you can stop with the distortion and stop fomenting entropy. I had a bit of thermodynamics in a P Chem course too.
Here is a video by the guy that did Oroville dam updates. He offers some suggestions as to what might have happened. Lasts about 10 minutes.
https://www.youtube.com/watch?v=GxQJj8D_FE0
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