Re: Pedestrian bridge collapses in Florida

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Re: Pedestrian bridge collapses in Florida
Posted by FtGreeneG* on Fri Mar 16 23:24:24 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by FYBklyn1959 on Fri Mar 16 17:19:54 2018.* Ok I guess being an artery deemed essential for traffic flow would play a factor in the decision to keep it open during dtress test and resulting repairs. Still not a wise one though. Good thing you weren't there that fateful day.
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Re: Pedestrian bridge collapses in Florida
Posted by Fred G* on Sat Mar 17 02:33:27 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Catfish 44 on Fri Mar 16 21:40:45 2018.* Actually it was simple negligence in the case of the Kansas City walkway.
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Re: Pedestrian bridge collapses in Florida
Posted by AlM* on Sat Mar 17 02:49:37 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Catfish 44 on Fri Mar 16 23:08:37 2018.* Look at a picture before it collapsed. It's got an upper and lower level with diagonal girders forming a triangular support pattern. That makes the whole bridge rigid.
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Re: Pedestrian bridge collapses in Florida
Posted by Bill Newkirk* on Sat Mar 17 05:37:50 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by FYBklyn1959 on Fri Mar 16 17:19:54 2018.* Probably should have, but that is a major east-west arterial in that area. It is actually US 41, so it continues past the populated area to the west coast of Florida and will take you to Naples, Bonita Springs, Fort Myers, etc. May go all the way to the Tampa Bay area. Wasn't the street closed to traffic when the completed bridge was rolled into place ? Traffic was rerouted then, why not on the day they did the stress test ? Bill Newkirk
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Re: Pedestrian bridge collapses in Florida
Posted by Bill Newkirk* on Sat Mar 17 05:44:02 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by AlM on Fri Mar 16 21:40:17 2018.* The design of this bridge was probably fine - it just wasn't properly set onto its base, and they tried to adjust it while traffic flowed underneath. It looks like it just slipped off the base it was supposed to rest on. How did this bridge just suddenly slip off the base ? An earthquake would have done that but there wasn't one. I think since this bridge wasn't properly supported, the stress was too great near the base and gave way at that point. Bill Newkirk
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Re: Pedestrian bridge collapses in Florida
Posted by Bill Newkirk* on Sat Mar 17 05:48:16 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Catfish 44 on Fri Mar 16 18:17:02 2018.*
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Re: Pedestrian bridge collapses in Florida
Posted by Catfish 44* on Sat Mar 17 08:06:43 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by AlM on Sat Mar 17 02:49:37 2018.* From what I see it's not a Warren, Pratt, or Howe truss. Its not any kind of a traditional truss which is why I say they were getting cute.
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Re: Pedestrian bridge collapses in Florida
Posted by Catfish 44* on Sat Mar 17 08:11:34 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by JayZeeBMT on Fri Mar 16 23:17:53 2018.* The revised design essentially lost redundancy. Somewhere in this bridge redundancy was lost as well.
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Re: Pedestrian bridge collapses in Florida
Posted by Catfish 44* on Sat Mar 17 08:15:32 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Fred G on Sat Mar 17 02:33:27 2018.* And negligence is usually the result of cutting corners in the thought that the designers are smarter than their predecessors and have figured out a slick way to avoid axioms of engineering.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Sand Box John* on Sat Mar 17 09:24:04 2018, in response to Pedestrian bridge collapses in Florida, posted by TransitChuckG on Thu Mar 15 14:36:46 2018.* Uncle Bumblefuck from Canuckistan knows what he talking about. He does stress tests and tear downs to show how and why stuff fails or doesn't fail. John in the sand box of Maryland's eastern shore.
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Re: Pedestrian bridge collapses in Florida
Posted by AlM* on Sat Mar 17 10:17:18 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Catfish 44 on Sat Mar 17 08:06:43 2018.* OK. But I'd be very surprised if it turns out the design of the truss was the cause of failure. But we'll see.
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Re: Pedestrian bridge collapses in Florida
Posted by AlM* on Sat Mar 17 10:39:06 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Catfish 44 on Sat Mar 17 08:06:43 2018.* OK, I stand corrected. Having watched Sand Box John's posted video, it sure looks like a cute design contributed, then followed by improper transport and improper correction techniques, neither of which would have been an issue if it hadn't been a cute design.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Henry R32 #3730* on Sat Mar 17 11:51:20 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Sand Box John on Sat Mar 17 09:24:04 2018.* This video is fantastic, nice find!
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Catfish 44* on Sat Mar 17 11:53:33 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Sand Box John on Sat Mar 17 09:24:04 2018.* Keep your nuts in a vice.
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Re: Pedestrian bridge collapses in Florida
Posted by Catfish 44* on Sat Mar 17 12:08:00 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by AlM on Sat Mar 17 10:39:06 2018.* If anything I wonder how the truss doesn't add a level of redundancy to prevent a failure.
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Re: Pedestrian bridge collapses in Florida
Posted by AlM* on Sat Mar 17 12:14:09 2018, in response to Re: Pedestrian bridge collapses in Florida, posted by Catfish 44 on Sat Mar 17 12:08:00 2018.* The truss is critical in making the whole bridge really stiff. What I infer from the video John posted is that this bridge had less redundancy than many, and when it was mishandled during installation a lot of the redundancy that was left was destroyed. Then there wasn't enough redundancy left when they over-tightened a rod and caused it to fail.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Sand Box John* on Sat Mar 17 13:01:36 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Henry R32 #3730 on Sat Mar 17 11:51:20 2018.* This video is fantastic, nice find! I have been watching his stuff for better part of a year. He kills ~~three~~, four birds with one stone. He enlightens, informs, educates and amuses all at the same time. John in the sand box of Maryland's eastern shore.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Sand Box John* on Sat Mar 17 13:16:46 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Catfish 44 on Sat Mar 17 11:53:33 2018.* The man uses an amusing, extensive, bastardized vocabulary. AvE-Dictionary John in the sand box of Maryland's eastern shore.
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Re: Pedestrian bridge collapses in Florida
Posted by chicagomotorman* on Sat Mar 17 14:34:37 2018, in response to Pedestrian bridge collapses in Florida, posted by TransitChuckG on Thu Mar 15 14:36:46 2018.*
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by jimmymc25* on Sat Mar 17 23:44:18 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Sand Box John on Sat Mar 17 09:24:04 2018.* Thank you for that....much appreciated.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Sand Box John* on Sun Mar 18 07:50:01 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by jimmymc25 on Sat Mar 17 23:44:18 2018.* Thank you for that....much appreciated. You are welcome. John in the sand box of Maryland's eastern shore.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Fred G* on Sun Mar 18 11:40:33 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Sand Box John on Sat Mar 17 09:24:04 2018.* Interesting to see what the investigation brings out.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by Sand Box John* on Sun Mar 18 17:46:58 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Fred G on Sun Mar 18 11:40:33 2018.* Interesting to see what the investigation brings out. Me thinks AvE will be proven to have pointed out the point of primary failure. John in the sand box of Maryland's eastern shore.
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Re: Pedestrian bridge collapses in Florida [EXPLAINED !]
Posted by AlM* on Sun Mar 18 18:05:19 2018, in response to Re: Pedestrian bridge collapses in Florida [EXPLAINED !], posted by Sand Box John on Sun Mar 18 17:46:58 2018.* point of primary failure I interpreted the video as indicating multiple failures, no one of which would have sufficed: - Too little redundancy, so that the failure of one rod could bring the bridge down. - Failure of the movers to obey instructions. - Failure of the engineers to realize that serious damage had been done.
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