Article

2018-03-21 -Lurid Crime Tales-

Major Design Change Changed Collapsed Bridge's Cost, Schedule

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Posted by Frank G 2018-03-21 11:30|| || Front Page|| [2 views ] Top

#1 so apparently, this was supposed to be a cable stayed bridge with the support tower on one of the ends instead of in the center of the span

and also they decided to place the deck structure before they built the support tower

???

Posted by lord garth 2018-03-21 16:10|| 2018-03-21 16:10|| Front Page Top

#2 This was interesting...why the bridge collapsed.

https://youtu.be/ioC61QW7SHQ

Posted by BrerRabbit 2018-03-21 16:48|| 2018-03-21 16:48|| Front Page Top

#3 garth,
As I understand it, the suspension cables were only for show. They didn't carry any load. The temporary support on the end that failed was supposed to be under the single truss at that end. Instead, it was placed further towards the middle leaving that end to sag. Concrete is great under compression but sucks wind under Tension.

The tension bars were already stressed to the limit when they tried to tighten them and it soon failed.

Posted by Omoter Gligum2747 2018-03-21 16:49|| 2018-03-21 16:49|| Front Page Top

#4 I do this for a living and I still don't know enough to say confidently why it failed. One box was checked off - the materials were all US-Origin for steel, as should the cement (just because it's cheaper), so not likely a sleazy material swap-out

Posted by Frank G 2018-03-21 19:56|| 2018-03-21 19:56|| Front Page Top

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