Posted on 03/16/2018 12:25:26 PM PDT by C19fan
Engineering experts say investigators looking into the collapsed ‘instant’ bridge in Miami will want to know why a central tower which is usually built to support a suspension bridge was not in place when it collapsed onto Tamiami Trail on Thursday afternoon.
Last week, Florida International University’s official Twitter account posted a rendering of the bridge in its completed form as envisioned by the planners before its opening to foot traffic in early 2019.
The rendering shows a tall central column with cables connecting it to the main span.
Engineers say the design is known as a ‘cable-stayed bridge,’ which is a kind of suspension bridge, according to USA Today.
(Excerpt) Read more at dailymail.co.uk ...
The armchair quarterbacking is strong with this one.
Some architects and engineers simply must NOT be allowed to build the “wall” to our south... in the Western USA...
liberals: building things that are unsustainable to support from the beginning of time.
I spent several years performing structural dynamics work and studies for the DoD and the first thing I thought was why they didn't have temporary shoring placed at the Median until the support structure and the Cable Stays were installed and tensioned.
Always over-engineer and account for safety, even if the numbers tell you differently.
The Tatars are the people who are native to Crimea and who have been historically savaged and slaughtered by the Russians.
The topic was the central tower. The prefabricated spans needed space to be swung into place and the tower would interfere with those operations.
Thus, it is constructed after the spans are in place and properly tensioned
If you scroll down the article just after the video, there’s a photo of the top deck after the collapse. There’s a raised area with anchor bolts where the plate for the cable stays was to attach. There is a large cable protruding diagonally out of that raised area. I’m thinking that cable ran through the diagonal web to the lower deck and maybe that’s where the failure occurred. Maybe they were tightening that cable to adjust the camber.
“Always over-engineer and account for safety, even if the numbers tell you differently.”
I concur 100%
“I’m still trying to figure out what a tatar is.”
They invented the sauce silly, everybody knows that!
“... This bridge was open to pedestrians when it collapsed ...”
-
That is just not true.
It absolutely was not open to pedestrian traffic.
Stop spreading falsehoods.
.
Doesn’t make sense.
Long spans are usually done with two cranes, so there isn’t much swinging possible anyway. Pre-positioned winches do the work of actual positioning.
“INCOMPETENCE”
In light of events, that is rather obvious. Whose is the question. Contractor’s field superintendent? Structural Engineer for the designer of record? Owner’s contract or field directive? Construction Manager’s directed sequence and CPM schedule? Designers stipulated ABC sequence?
Thet there was the best four years o'my life, no lie!
.
There obviously was no outside review of this design!
Everything about this thing is beyond unorthodox.
You’re probably correct that “Flawed construction process” is most likely, specifically that the truss was installed without a temporary strut in the middle to hold it up until the cable superstructure could be installed.
The question then becomes “Did the design engineers agree to this particular installation sequence?”.
.
I would say at every level.
Standard practice was absent in every element in view.
Thanks. Hadn’t heard that.
.
The contractor was the designer. (design-build)
Instead of “ABC” they should have named it “ABCD” - “Accelerated Bridge Construction / Destruction” method.
” Statics and Mechanics”
Gosh I hated that course! Slide rules, pre calculator!
.
This bridge was an element of the population control master plan.
Disclaimer: Opinions posted on Free Republic are those of the individual posters and do not necessarily represent the opinion of Free Republic or its management. All materials posted herein are protected by copyright law and the exemption for fair use of copyrighted works.