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Saw the plans for the FIU bridge. Lol, what a joke.
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Date: March 16th, 2018 7:15 PM Author: Blathering french chef trailer park It wasn't a cable-stay bridge, it was a FAKE-cable stay bridge. The stays were going to be empty 16" metal pipes that did nothing except "look cool". That's why the bridge was designed (badly) to span the entire length without stays or temporary supports.
The bridge was one giant I-beam with the deck as the bottom flange, the canopy as the top flange, and the struts acting as the web. The struts were highly non-redundant and if one failed would cause a near-instant failure.
There was apparently some trouble with the PT bars at the 2nd truss from the support where the tower was supposed to be. They were apparently re-stressing the PT bars the day when it collapsed, which is why there was a crane there (to lift stressing equipment up there). It failed anyway and cause a near instant collapse. The surveillance footing is pretty shocking in how fast it went down. As to what cause the failure in this one member, I couldn't tell you with the information I have.
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Date: March 16th, 2018 7:17 PM Author: Costumed Exhilarant International Law Enforcement Agency Milk (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35621978) |
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Date: March 16th, 2018 7:19 PM Author: Aggressive Brethren so basically it was the bridge equivalent of spics putting 21" rims and a $500 stereo in a used Hyundai Elantra (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35621987) |
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Date: March 16th, 2018 7:21 PM Author: Pearly Azn Locale (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622014) |
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Date: March 16th, 2018 7:21 PM Author: Blathering french chef trailer park Realtalk, the bridge itself, sans the tower+stays, was a pretty impressive engineering feat (if it were actually designed and constructed correctly), so more like putting 21" rims and a $500 stereo on a Ferrari. (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622016) |
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Date: March 16th, 2018 7:35 PM Author: Cruel-hearted Soul-stirring Clown Location can you expound on this? (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622109) |
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Date: March 16th, 2018 7:42 PM Author: Glassy hell (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622145) |
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Date: March 16th, 2018 7:49 PM Author: Blathering french chef trailer park Casting a span this large off site then sliding it into place is quite a feat. The design is interesting in that its using the top flange both as a structural member and as a canopy for the pedestrians underneath, allowing a very deep beam that doesn't look "deep" because of the very open nature of the struts. But that was the critical flaw of the design. If they had beefed up the struts or just used a solid web, then you'd lose the "open" effect. Can't have it all. (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622200) |
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Date: March 16th, 2018 7:52 PM Author: vibrant chartreuse space pistol And by spics you mean ARE Reptile (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622215) |
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Date: March 16th, 2018 7:25 PM Author: red unholy area filthpig oh, my god - i do not unterstand! i am swedish btw (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622043) |
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Date: March 16th, 2018 7:36 PM Author: Histrionic idiot tanning salon I'll admit that I don't know the first thing about what I'm looking at, but I found the asymmetry in the struts to be really off-putting (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622110) |
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Date: March 16th, 2018 7:41 PM Author: Blathering french chef trailer park The struts make sense aesthetically when you see the final condition with the (fake) stays - the struts match the angle of the stays. But the stays are fake so who cares. (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622140) |
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Date: March 16th, 2018 7:47 PM Author: Histrionic idiot tanning salon What's the point of the asymmetry though?
Seems like it would be stronger and easier to design with symmetrical struts |
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Date: March 16th, 2018 7:53 PM Author: Blathering french chef trailer park Abso-fucking-lutely, which is why they should have ditched the pointless stays and designed the struts with a regular geometry.
Warning YUGE pdf, but see page 101 for what they wanted to do:
https://facilities.fiu.edu/projects/BT_904/MCM_FIGG_Proposal_for_FIU_Pedestrian_Bridge_9-30-2015.pdf
They should have made the struts like a Howe truss:
https://www.garrettsbridges.com/design/howe-truss/ |
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Date: March 16th, 2018 7:39 PM Author: mind-boggling coral base Would adding cable stays have ended racism, would it have ended sexism? (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622122) |
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Date: March 16th, 2018 7:47 PM Author: Comical turquoise multi-billionaire cruise ship (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622186) |
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Date: March 16th, 2018 10:01 PM Author: Blathering french chef trailer park he a good bridge, dindu nuffin. (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622952) |
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Date: March 16th, 2018 7:42 PM Author: mind-boggling coral base Shouldn't a federally funded bridge have extremely rigorous requirements? (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622148) |
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Date: March 16th, 2018 7:46 PM Author: Glassy hell no AA here, amigo (http://www.autoadmit.com/thread.php?thread_id=3920761&forum_id=2#35622175) |