perhaps too early, just looking at possibilities.
1 posted on
03/16/2018 3:59:12 AM PDT by
csvset
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To: csvset
This was a very long span and then they used very heavy material, he said. The majority of pedestrian bridges are steel. Steel bridges are about one-tenth the weight of concrete, he said.
...
I’ve seen long steel pedestrian bridges over the turnpike for decades. They are probably a lot cheaper, too.
40 posted on
03/16/2018 5:02:24 AM PDT by
Moonman62
(Make America Great Again!)
To: All
Here's a great dessert idea---Jasper Johns' iconic three-tiered flag becoming a layer cake.
Okay-----serve a second cake decorated like the French flag.
45 posted on
03/16/2018 5:17:31 AM PDT by
Liz
((Our side has 8 trillion bullets;the other side doesn't know which bathroom to use.))
To: csvset
I think this was a pure constructor screwup.
See this video animation of the bridge:
https://youtu.be/5Y_71L35CvM
This shows a cable-stayed bridge design. The upper stays were not in place, yet they had no temporary supports at the midpoint of the bridge until that tower on the one side was constructed and the cable stays in place. There was nothing providing necessary up force, and the bridge was simply not able to support itself.
I dont think this had a thing to do with tweaking the tension on the post-tensioning cables/tendons. Or if it did, that was not the root of the problem.
48 posted on
03/16/2018 5:24:38 AM PDT by
FreedomPoster
(Islam delenda est)
To: csvset
The centers director, Atorod Azizinamini, recognized by the White House in 2016 One of Obama's crew?
51 posted on
03/16/2018 5:31:35 AM PDT by
PAR35
To: csvset
It appears the bridge was a fully suspended bridge without center supports. Why wasn't the bridge suspended and stress tested on the side of road where it was constructed before it was moved into place? So many questions - - - concrete composition, sufficient cure time, weird support design of the triangulation support system and only one center support running down the center of the span, which would increases side to side flexing and buckling. Was concrete fractured during moving.
To: csvset
As long as the project met its minority ‘goals and quotas’, it’s difficult to see what the problem is here.
60 posted on
03/16/2018 6:01:15 AM PDT by
BobL
(I shop at Walmart and eat at McDonald's...I just don't tell anyone)
To: csvset
Sounds like a problem with pre tightening and post tightening in relation to moving the bridge around. Sounds like they may have cracked it during moving.
65 posted on
03/16/2018 6:14:06 AM PDT by
jetson
To: csvset
I used to do construction and one mantra was "if you don't start out right,you don't end up right." This whole idea was a disaster from the get go.
66 posted on
03/16/2018 6:14:47 AM PDT by
4yearlurker
("There stands mother under the oleanders,open the windows." A dying cowboys last words,1879.)
To: csvset
Somewhere there exists an engineer who said don’t do this. He is soon to be fired
71 posted on
03/16/2018 6:22:13 AM PDT by
BRL
To: csvset
Trumps tariffs caused this. They could not afford steel so went with concrete. /s
73 posted on
03/16/2018 6:25:41 AM PDT by
pas
To: csvset
One would think there would some cctv footage of the bridge collapsing, particularly if “stress testing” was being conducted and FDOT officials were present at the time of the collapse.
77 posted on
03/16/2018 6:32:21 AM PDT by
Godebert
(CRUZ: Born in a foreign land to a foreign father.)
To: csvset
FIU started a center to advance the frontier in the field in 2010 after identifying a need for more engineers trained in the method. Since launching in 2011, the center has drawn 4,000 people to its webinars, according to the website. In 2016, it became one of just 20 accelerated building programs nationwide to receive federal funding that amounts to $10 million over five years. The center was not formally involved in constructing the pedestrian bridge.
The centers director, Atorod Azizinamini, recognized by the White House in 2016 as one of the worlds leading bridge engineers, said the method is safer and more efficient than conventional construction methods.
Obama’s democrat government, spending democrat money, by democrat politicians in a democrat-controlled city in a democrat congressional district? “We don't need no stinkin’ engineers!”
78 posted on
03/16/2018 6:44:21 AM PDT by
Robert A Cook PE
(I can only donate monthly, but socialists' ABBCNNBCBS continue to lie every day!)
To: csvset
When will we find out the construction company hired “day laborers” (i.e. Illegal immigrants), who did less than adequate work?
JoMa
87 posted on
03/16/2018 8:02:06 AM PDT by
joma89
To: csvset
In almost all bridge or building collapses, he added, construction is at fault, not design.This walkway component was a length of 175'. If the engineer/designer didn't allow for the full, finished 'service load'...see Florida.
You have to build the arc in.
And that's just the bottom deck. Add in the weight of the trusses and cover and imagine the arc needed. (there's a formula to figure this all out)
It's a good thing he said "almost"!
102 posted on
03/16/2018 6:00:02 PM PDT by
philman_36
(Pride breakfasted with plenty, dined with poverty and supped with infamy. Benjamin Franklin)
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