Posted by paul on March 17, 2018 at 08:26:55 from (66.60.223.229):
In Reply to: Here is the number posted by showcrop on March 17, 2018 at 07:24:07:
Was this cable pulled through concrete prestressed?
well, either the cable or the concrete gave out.
The stress of moving it was much harder than typical build in place, and so the weakness showed up right quick, instead of 20 years down the road.
Will be pretty easy to sort it out. Designed with a weak spot, or built with weak materials, or assembled wrong, it will be one of those and easy to figure. Of course all three will point to each other, but if the right folk get to look over the specs and rubble nothing will hide.
I will guess the design wasn't strong enough for the move, something flexed more than the designer thought of. But that flaw showed up because something else wasn't up to par. Weak batch of concrete, or bad cable ends, or the fellas didn't tighten the cables right.
Almost always takes 2 mistakes for something like this to show up. Everyone over engineers enough to deal with one bad issue.
Sad for the people involved.
Same company built the new bridge in Minneapolis, to replace the one that collapsed a few years ago. So, hummmm. The old bridge that collapsed had the wrong gussets, they were only 1/2 as thick as they should have been. Too weak. But the bridge stood for decades no problem. Until salt eroded some metal, and they did construction on top of the bridge and the crew piled material very heavy in one spot on the bridge deck.... so it took 3 issues to bring that bridge down. Bracing was too thin, salt corrosion, and overloaded point load.
Wonder how well they designed and built the new replacement bridge? It was designed and built in a hurry.
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