Came here to see what my physics teacher was talking about
@arcl85184 жыл бұрын
me too
@arleneagunias-daantos55214 жыл бұрын
lmao for me it's my dt teacher
@zayasi44104 жыл бұрын
Came here to do my homework :(
@orangestudio17113 жыл бұрын
Damn our teacher must have came from the same place
@scenzonhain38153 жыл бұрын
Same lol
@harmonicresonanceproject2 жыл бұрын
I was there that week when it opened - it was not so busy when we went so not swaying too badly, but everyone was talking about it. Happy days though, back in 2000.
@carschmn7 жыл бұрын
The people on the wobbly bridge look like they are having a dance party.
@vipulprakash19875 жыл бұрын
The design, the diagnosis of the pedestrian induced vibration problem and the remedy are all defective. 1. The Design is defective as an unstable transverse configuration was chosen. If you consider the transverse X-section of the bridge deck, you will find that the gravity load on the footpath and the two equilibriating reactions from the inclined ties between the deck and suspension ropes are collinear, and the three meet at a point below the deck. In the very first course of structural analysis, usually called Engineering Mechanics or Statics, we are taught that a 2D structure, such as a Beam, supported by 3 reactions will be unstable if the 3 reactions are either parallel or collinear. In this case there are two reactions along the line joining the deck with the suspension cables on either side and the gravity load vector passing vertically through the deck center. The three force vectors are collinear through a point below the deck and lying on the vertical through the deck center. About this point the deck can rotate without any resistance. This wobbly motion is what actually happened. 2. The diagnosis of the problem is wrong on even more accounts. Suspension bridges are typically even more flexible with very long periods of vibration. They do not exhibit pedestrian induced vibrations. Truss bridges as well as Beam bridges on the other hand are very stiff with very short periods of vibration. They also do not exhibit pedestrian induced vibrations. For economic reasons the sag of the suspension cables in suspension bridges is kept large, usually Span/10 and only vertical sag is provided. In this case a very shallow inclined sag of span/60 was provided. This not only made the bridge uneconomical but 6 times more stiffer than a usual suspension bridge with a sag of span/10. This increased stiffness reduced the period of vibration by 2.5 times, and made it coincide with the period of pedestrian footfalls. 3. The remedy for the mis-diagnosed problem costed about 25% of its initial cost. It involved installation of a large number of damping devices that would involve frequent maintenance. There are thousands of bridges of all types designed by run-of-the-mill structural engineers that continue to function well. In most of them neither wind-induced nor pedestrian-induced vibrations have been considered in design. In fact most of the existing bridges were designed manually with the help of slide rule or calculators - - the structural analysis computer programs were non-existent. The designers then knew their structures more intimately. The existence of Modern structural analysis and design computer software disengages the designer from analysis and design and is the cause of the problem.
@chris21455 жыл бұрын
TLDNR and i speak for everyone
@thespacejedi4 жыл бұрын
@@chris2145 its TLDR
@SobrietyandSolace2 жыл бұрын
Ok I have no idea how they fucked this up so catastrophically because as a total layperson who knows nothing about bridges or engineering your comment makes sense to me, so surely someone who studies this shit for a living would have had the foresight.
@IamChandEvil9 жыл бұрын
Dubstep bridge with low natural frequency wobbles
@trinhang75102 жыл бұрын
Even though they know the bridge was moving, they kept walking and standing there.
@MrFindlaya6 жыл бұрын
Does anyone know where this footage comes from? I want to get access to a higher quality version of it.
@Platypi00711 жыл бұрын
You didn't actually pay attention to the video... They discovered that many bridges exhibit this kind of motion when a lot of people walk over them at the same time. It isn't the bridge design--it's a function of people responding the the movement of the bridge amplifying the effect. It's resonance.
@rensseak4 жыл бұрын
I think all the people taught to get in sync with bridge just for easyer walk on it. But with that it got more worse.
@set9213 жыл бұрын
No. They closed it for 2 years and fixed it. Most bridges don't resonate this severely.
@jimmydcricket58933 жыл бұрын
160 people isn't that many.
@abbyosborn4132 жыл бұрын
@@jimmydcricket5893 there was 250+ people on that bridge that day
@JangoFett2204 жыл бұрын
Now I understand why Craig Charles referred to this bridge while describing Bridge Ball on Takeshi’s Castle
@SobrietyandSolace2 жыл бұрын
Bumped into him at Comicon a few years back
@shazf187 жыл бұрын
This is the same bridge in Harry Potter that the death eaters bring down
@moneymule82095 жыл бұрын
and somehow normal people still have no idea magic exists....
@Davvg3 жыл бұрын
read another book
@carolwhittle8336 жыл бұрын
RIP Tony. God bless, Carol
@ThomasGabrielsen4 жыл бұрын
Stephen Fry @ 2:19
@Undamen9 жыл бұрын
London bridges swaying around
@GOTTshua11 жыл бұрын
Frequency of our hearts, aligned for good, would be a blessing.
@jamie99265 жыл бұрын
Anyone here from Humble Pi?
@schwarzerritter57245 жыл бұрын
SciShow.
@peggyperl11 жыл бұрын
Very interesting!
@major60015 жыл бұрын
Fascinating...and kind of funny.
@IronMan-qi3yg7 жыл бұрын
RIP Tony
@imapaine-diaz44513 жыл бұрын
They should have realized that any large group of persons walking together tend to very soon match their stride to follow the pace of the group. if they don't, they soon start tripping over each others feet. this produces the same effect as a marching troop of soldiers and for the same reason.
@bagoh43 жыл бұрын
Reminds me of Goomba's from the live action movie swaying side to side.
@rexster6316 жыл бұрын
Unfortunately they still dont get it, the on or off wobble is a phase transition, the people walking in synch did it because the wobble made them synch. Read Strogatz book Synch.
@djbeninatl12 жыл бұрын
At 3:00, the ppl look like a bunch of penguins.
@GulshanVerma4 жыл бұрын
ok
@MatSallehBoleh13 жыл бұрын
I love Pat Dallard, master of understatement at 00:44. "It was, erm, very disappointing". Don't you mean "we shat bricks"?
@johneastmond909214 жыл бұрын
Some folks (I'm sure) think that's a dumb question. It's not! The structure has enough mass that the stationary momentum would keep things stable w/ the number of people who would be on the bridge at once on a typical day. The fix is quite elegant! Can you see the change?
@Gofaqyaselves3 жыл бұрын
Who knew the G-force generated by thousands of people could warp a big ass bridge like that. Trippy
@sparlexna13 жыл бұрын
The "giggidy giggidy" bridge would be a nice name :)
@andrewstearns14445 жыл бұрын
Anyone here from ECE 504?
@AnwarMuhammad7093 жыл бұрын
Who there in 2020 November
@set9213 жыл бұрын
The marching in unison myth has been disproven.
@pianojamboree60013 жыл бұрын
Differential Equations brought me here :(
@plutoh284 ай бұрын
same.
@noahloos24763 жыл бұрын
Unterricht 2020
@HarkyOfficial13 жыл бұрын
@45pudding haha so am I and my lecturer told us to watch this video!
@scilabo12 жыл бұрын
@dnahk2483 not to mention Structural Engineers!
@mwhiten1003 жыл бұрын
Alexandria Bridge, Ottawa at 4:50
@zennynequin14058 жыл бұрын
Anybody that has been on a ship knows this...They messed up
@xman4un15 жыл бұрын
Does one want a bridge to react that way???
@theallie75777 жыл бұрын
They said people were hanging on to the bridge cuz it was moving so much Disappointed.......
@IanBPPK11 жыл бұрын
What questions to ask......
@TopGearrules14 жыл бұрын
Why didnt they just keep it like that!
@JuicerMcGooserr3 жыл бұрын
Bridge
@adammineris12 жыл бұрын
Do a AMA?
@abdelhamidahajjam25178 жыл бұрын
Mines 2016 :')
@lucasthelisson73727 жыл бұрын
Dedicace a damien dupré
@johneastmond909215 жыл бұрын
How do you NOT know about pedestrian lateral loads?! Any video of people walking shows side-to-side motion in they're upper bodies. (That sideways motion requires lateral loading) People on ice demonstrate need for lateral containment. (Feet kick out to side) How many ways can you think of someone accidentally doing the splits? What about the ways you have slid?
@Seanmcdhuibhne13 жыл бұрын
Why not call it The Diddy Bridge or The Drunken Bridge
@jamestoyn97556 жыл бұрын
in what year did the bridge open.
@bullman8614 жыл бұрын
@merederem not that my mum
@skyline_drones14 жыл бұрын
@dnahk2483 more Civil Engineering than Mechanical but ok :)
@carmusen15 жыл бұрын
It was the Death Eaters!
@AccatagliatoIt10 жыл бұрын
il Millenium Bridge, il ponte pedonale sul Tamigi, inaugurato il 10 giugno 2000 è stato chiuso dopo 2 giorni a causa delle forti oscillazioni laterali dovute alla risonanza indotta dal passaggio dei pedoni. Per limitare le oscillazioni forzate del ponte sono stati inseriti smorzatori che dissipano l'energia trasmessa in modo inconsapevole dai pedoni
@AccatagliatoIt10 жыл бұрын
Il Millenium Bridge è un ponte pedonale sul Tamigi nel cuore di Londra. Si tratta di un ponte lungo 325 m, diviso in tre sezioni, la cui caratteristica principale è che le funi di sospensione, anziché essere poste sopra il piano stradale, come accade nella maggior parte dei ponti sospesi, sono poste ai lati, dando a chi lo attraversa un maggiore senso di . Il ponte è stato progettato per sopportare il passaggio, in condizioni di lavoro ordinario, di 5000 persone simultaneamente. Il ponte è stato aperto nel giugno del 2000, e il problema che ha portato alla sua chiusura due giorni dopo si è manifestato proprio nel giorno dell'inaugurazione. Dopo che il ponte si era riempito di pedoni che camminavano nelle due direzioni, si è instaurata una oscillazione laterale che, induceva i passanti a modificare la propria andatura fino a camminare tutti all'unisono. Pur non rivelandosi distruttiva, l'oscillazione spostava il piano del ponte da destra a sinistra per 7 cm, e rendeva necessario ad un numero significativo di persone di reggersi alla balaustra per mantenere l'equilibrio.
@lourdescolomes86863 жыл бұрын
Quién llegó aquí por instagram.com/tercosmicqu...?
@Foxy.Tea.3 жыл бұрын
Bruh
@arleneagunias-daantos55214 жыл бұрын
who else is here because their teacher sent them here.
@gwydion534811 жыл бұрын
phteven
@bekjanomirzak2244 жыл бұрын
Is there anybody else who is watching this after reading section of IELTS?
@Pwells115 жыл бұрын
Curse you Bellatrix!
@thegombie7 жыл бұрын
stupid biased video. Rope bridges have existed for ages, and we all know what happens when you sway on them.
@hellopellos12 жыл бұрын
upvote me for le reddit xD!
@whythelongface41495 жыл бұрын
Really shitty waste of money. 'Galloping Gertie' no2.
@Spudst3r12 жыл бұрын
What a poorly engineered bridge. You don't want bridges to shake!
@lihinilemon95975 жыл бұрын
It is science If you have learned physics you would understand It happened because the frequency of the force became equal to the natural frequency It is under simple harmonic motion