Re: Here is the number

Posted by paul on March 17, 2018 at 08:50:59 from (66.60.223.229):

In Reply to: Re: Here is the number posted by paul on March 17, 2018 at 08:26:55:

Hadn't looked at that thread, since you seem to have a wedgie about it, I read through it.

Folks always speculate about a failure, until we get actual results, folks are going to ponder on it.

I was wondering about the odd angles in the middle supports when I saw pictures they didn't make structural sense; now I see - this was going to be a suspension bridge. So all those off center angle pieces along the middle make sense when it's done,, but don't support well without the top cables.

So:

They built 2/3 of the bridge, the middle backbone.

And hauled it into place on two large jacks, supporting it from below 1/3, 2/3, 1/3 sagging load and expanding itself.

They hung it there, and supported it from the ends. There may or may not have been a temp middle support too? So it was now a sagging load, but supported from 2 or 3 totally different different pressure points. Still in expansion.

Then, the plan was to put the real middle support in, and run cables, and support the bridge from multiple cables. So supported from multiple vertical compression points. And compressing itself.

So........

They had to design this hunk of concrete to take the stress of:

moving.

And supporting itself in -two different- bottom lift configurations no compression; and then eventually stand for decades with live loads in a suspended, compression design.

Wow!

That thing had to be designed for 4 different load points and stresses. Bottom support and top hung are totally opposed to each other when building with concrete, very goofy to try to do that with a long skinny piece of concrete. Some city council got their fingers into the plans and 'wouldn't this be cool' and made it the mess it is.

Ultimately the designers failed, but they were asked to do the impossible on that deal.

Paul

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