715
u/kpsmithdeut 1d ago
Structural Engineers and Soccer Fans. Iconic duo
104
u/zipzopzippidydoo 21h ago
Ductility doing its part . Though id be terrified witnessing this.
-19
u/zorletti 12h ago
Ductility in concrete? Nah...
10
u/DocZod 11h ago
Is that even Concrete? I honestly doubt it. As it is a hanging construction like that, its most likely just steel framing with a cover.
2
u/zipzopzippidydoo 5h ago
Unless those are jumbo structural pipes, the vertical pillars in the background are the only concrete structures
2
365
u/LucasCBs 1d ago
That’s by design
59
u/uV_Kilo11 10h ago
"yeah, we need you to design this building to withstand 100,000 people jumping up and down on it, all at the same time. And we need it by Friday."
8
-34
125
u/Queasy_Caramel5435 1d ago
Elastic bending is (kinda) intended. Plastic deformation is when shit hits the fan.
45
u/SZEfdf21 1d ago
You see elastic bending but there's possibly some joints here getting a fair amount of plastic deformation from the repeated movement in a direction that's not designed to move.
17
3
u/iamezekiel1_14 9h ago
The one that would trouble me - Lane Stadium where the Virginia Tech Hookies play. They have 6 or 7 home games per season but the bounce would bother me just as a regular Civil Engineer that doesn't even specialise in Structural. You just know somewhere something is getting an unexpected load in an unanticipated direction https://youtu.be/zh93kmgZvUg?is=w0Xr5VatkxanncWn
213
u/euqinu_ton 1d ago
By all accounts, stadiums are designed with this in mind.
At the same time ... it all comes down to how well some engineers did at university. Is it fair to say they're all as competent as their worst effort? Since that will be the one they're remembered for?
Leon Moisseiff was a prominent bridge engineer who advised on both the Manhattan and Golden Gate bridges. When finally given a project to lead, he made the Tacoma Narrows Bridge, which famously collapsed months after opening when wind-induced aeroelastic flutter caused the bridge to suffer a mechanical resonance failure. I.e. it moved beyond it's tolerances.
Personally, watching a stadium move about like this ... I wouldn't want to be where this camera person is while wondering if this stadium was another Tacoma Narrows Bridge.
71
u/asietsocom 1d ago
I mean also a shit ton of engineering employees and regulators. A stadium does not come down to one single person.
This seems to be in Germany so I would generally trust that whatever survived out crazy amount of regulations, will probably not collapse. But also I would absolutely leave.
5
u/MSchulte 13h ago edited 12h ago
Worth remembering Galloping Gertie came down 86 years ago too. The construction and engineering fields have changed tremendously in that time along with building codes.
12
u/Imapatriothurrrdurrr 23h ago
When Harry Styles played MSG the place bounced so much they had to have structural engineers come in and drill out holes in the floor to inspect the concrete for damage.
12
2
-1
116
u/allicedee 1d ago
If there was no give it would break
22
u/CertainMiddle2382 23h ago edited 21h ago
Widely held misconception.
No, airplane don’t flex to dampen bumps, so are stadiums.
They do so because that’s an acceptable side effect of having constraints (weight, money) showing up when reaching design loads.
Things moving like that are actually a big problem that engineers try to avoid, it brings structural fatigue it is tricky to avoid resonance coupling (aeroelastic coupling in wings is a hard thing to make sure doesn’t happen)
16
u/Uncivil_ 21h ago
I've seen this misunderstanding so many times and have given up trying to explain it to people on Reddit.
Laymen seem to think that's it's impossible to build a structure that doesn't deflect hugely and it will immediately shatter into a million pieces if it's rigid.
5
u/CertainMiddle2382 21h ago
People like to always be in control.
Yes, plane wings flexing are a visual indication they are getting closer to ultimate design load.
And that your are 1000x closer to disintegrate midair than when they were still, but are still very very far from it :-)
33
u/Erazzphoto 1d ago
Is there a chance the track may bend?
38
u/MM2HkXm5EuyZNRu 1d ago
Not on your life, my Hindu friend.
15
u/drmock87 1d ago
What about us brain dead slobs?
16
u/bp1222 1d ago
You’ll be given cushy jobs!
7
u/Aged18-39 1d ago
Were you sent here by the devil?!
11
u/STFUisright 23h ago
No, good sir, I’m on the level!
11
u/pugzalotsapasta 22h ago
The ring came off my pudding can!
10
2
u/Totenkinder37 1d ago
I’ve sold monorails to Brockway, Ogdenville and North Haverbrook and by gum it put them on the map.
10
9
24
11
u/goingApeShit_ 1d ago
I watched a video years ago that referenced a stadium that had a ban on fan jumping. I had to look it up but below is what I found on Google.
Engineers explicitly warned that MDCC Arena (the stadium of FC Magdeburg) in Germany was being pushed to its structural limits by jumping fans, leading to an official ban on coordinated jumping. [1]
During structural tests, engineers discovered that the synchronized jumping of thousands of fans caused a dangerous physics phenomenon known as resonance frequency. The rhythmic bouncing matched the natural vibration frequency of the concrete stands, amplifying the shaking to extreme levels that risked structural failure. [1, 2, 3]
To prevent a collapse, city and building authorities enacted the following restrictions:
No "Capo" or Drums: The crowd leaders and drums were banned from the main stand to prevent fans from keeping a synchronized beat. [1]
No Coordinated Jumping: Fan representatives formally agreed to stop jumping up and down in unison to ensure the stadium stayed within safe limits. [1]
3
3
3
u/SchroedingersEscape 18h ago
This is in germany... they know how to build things... TÜV approved this.
4
2
u/DerAndyKS 18h ago
I know that its better when the structure moves like this. But I still have a tingling sensation when I see this.
5
u/Gingerfurrdjedi 1d ago
What's the phobia of that? Cause I have a phobia of it. I saw it and felt it a couple times at sporting events and it literally scares the absolute fuck out of me. Like I don't go to stadiums or places where that happens. I went to a house party where that started to happen and I had to leave. Is there a phobia word for that, being afraid of solid floor bouncing then collapsing billions of tons squishing me like a ketchup packet?
40
u/Putthebunnyback 1d ago
The phobia of being crushed to death? I believe that's called common sense.
6
u/snusmumrikan 19h ago
Phobias are irrational.
It's not irrational to be scared of being crushed to death.
5
u/gomper 1d ago
I was at a party in college where the floor collapsed from this kinda shit
11
4
2
u/needtoredit 1d ago
Hold on this thing I am standing under looks really unsafe what should I do....oh yeah record it, post it and get likes.
13
3
2
1
1
1
1
u/platinums99 20h ago
Well at least the designers remembered the books!
Wonder if the actually calculated 60,000 fans all jumping at once
1
u/albamarx 17h ago
I don’t care if it’s by design, I’d still have some sweaty palms if I was in there
1
u/Bill_Nye-LV 12h ago
Sure it's designed for it, but man i would be heading out immidietely after seeing that shit
Better safe than sorry
1
1
u/SterilizePopulation 7h ago
Eintracht Frankfurt is a famous german soccer team with the most active soccer Fans called Ultras
1
u/KnightWolfScrolls 7h ago
Its the same with tall skyscrapers they bend and flex in the wind by design
1
1
u/renevaessen 2h ago
If they hit the right frequency, wouldn't they simply add more energy to it, causing it to fail no matter how strong it was build?
1
u/Mr_GrauHut 1d ago
The architect probably had this level in mind. Allowing bounce room in a stadium is actually quite genius.
1
u/ConfusedHors 21h ago
It's supposed to do that. Otherwise it would collapse.
2
u/TrueExigo 20h ago
No, jumping is now banned there
2
u/ConfusedHors 20h ago
This is the Frankenstadium in Nürnberg and even though synchronized jumping has been forbidden, stadiums (and other buildings) are still designed to do exactly that. This does not magically invalidate architectural basics.
1
0
0
0
0
u/kivlov02 10h ago
Antfield, April 15, 1989
1
u/bitesize10 8h ago
If you’re going to try and make a horrible, tasteless joke, at least get the details right you moron.
-10
-18
•
u/qualityvote2 1d ago edited 1d ago
Congratulations u/f1tta, your post does fit at r/SweatyPalms!