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Jambatan baru 6 bulan guna beralun macam riben menari-nari :D (video)

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Post time 22-5-2010 01:59 PM | Show all posts |Read mode
Post Last Edit by rose_liz at 22-5-2010 15:11

Ada sesiapa tengok berita terkini kat tv3 tadi? Tercengang2 aku tengok berita jambatan kat russia ni bergoyang2/ beralun camni...macam jambatan getah mainan je...baru 6 bulan digunakan. Ada sesiapa boleh terangkan fenomena ni tak?








edit:
aku paste info dari youtube...http://www.youtube.com/watch?v=kijlbqECoLY

May 21, 2010 — A 7km (four miles) long bridge over the Volga river in Volgograd, Russia, has been shut after the structure started to wobble. Strong currents in the river caused by the flow of water from melting snow upstream apparently loosened one of the bridge's vertical supports. Officials are deciding whether to reopen the bridge.

rupanya sebab arus kuat dari sungai tu yang menyebabkan fenomena ni terjadi. kejadian seperti ni pernah terjadi  kat U.S Tacoma Narrows Bridge pada tahun 1940, jambatan tu roboh selepas 4 bulan disebabkan windstorm.

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Post time 22-5-2010 02:04 PM | Show all posts
design flaws??
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Post time 22-5-2010 02:11 PM | Show all posts
vibrating bridge

oh nooooooooooooooo resonance ke aiiiiiiiiii bahaya ni jadi macam satu bridge kat States tu kan yg collapsed sebab depa lupa factor resonance
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Post time 22-5-2010 02:12 PM | Show all posts
Post Last Edit by mbhcsf at 22-5-2010 14:20

Reply 1# rose_liz

you avvy is cute....i meant to say the avvy..the last time i said, it costs a heart of a person...
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 Author| Post time 22-5-2010 02:18 PM | Show all posts
Reply 4# mbhcsf

u dah tgk ke video tu?
(thanks, avvy tu mmg cute kan? hehe...i curik dr pakcik google ... )
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Post time 22-5-2010 02:19 PM | Show all posts
ish..main2 ngn nyawa manusia ni..huhu
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Post time 22-5-2010 02:56 PM | Show all posts
tp jalan tu tak plak retak segala..amazing!
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Post time 22-5-2010 03:01 PM | Show all posts
memang pelik.. aku ingat camera trick... rupanya betul2... perhh... tapi kenapa jalan tak pecah....
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Post time 22-5-2010 03:06 PM | Show all posts
let me briefly explain the phenomena
Jambatan bergoyang disebabkan "resonance frequency"

Angin: sumber gelombang
membawa tenaga gelombang dengan frequensi tertentu

biasanya dalam waves equation bentuk forurier series : Sin(n pi x/n)/Sqrt L

ok...gelombang angin  tersebut disalurkan kepada jambatan : tenaga boleh dipindahkan dari satu medium ke medium lain
seterusnya menyebabkan getaran pada molekul jambatan
molekul jambatan bergetar pada frequecy = frequency angin
sekiranya frquency getaran adalah pada amplitud max, maka ia dinamakan "resonance frequency"
maka, resonance frequency menyebabkan molekul berjarak antara satu sama lain, seterusnya jambatan pecah & runtuh

teori boleh digunakan untuk mengelakkan pelantar minyak dari runtuh
kerana ombak yang kuat membawa tenaga gelombang yang besar, frequency tinggi
sekiranya frekuensi ombak = frequensi resonan pelantar
maka pelantar akan runtuh





p/s: mod, bila thread ini dah lapuk.. boleh pindahkan ke MKS..terima kasih

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Post time 22-5-2010 03:10 PM | Show all posts
why the photo dauwsq?
whyyyyyyyyyyyyyy?

the photo is...........aiyaaaaa
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Post time 22-5-2010 03:11 PM | Show all posts
err...abaikan
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Post time 22-5-2010 03:12 PM | Show all posts
mcm worm dance
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Post time 22-5-2010 03:13 PM | Show all posts
bila pelantar runtuh ....die, die die sume
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Post time 22-5-2010 03:32 PM | Show all posts
subhannallah...dasyat betul fenomena ini/...
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Post time 22-5-2010 03:49 PM | Show all posts
bila pelantar runtuh ....die, die die sume
mbhcsf Post at 22-5-2010 15:13


yup..sbb tu penting tahu kesan resonan frequency


biasanya engineer pelantar dh calculate/forumlate jenis bahan yg sesuai
rasenye by experimentally..u can decide which material is the best
cth analogikn gelas sbg bhn buatan pelantar....
kemudian setkan frequency bunyi (sound wave) tertentu yang boleh menyebabkan gelas pecah
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Post time 22-5-2010 03:50 PM | Show all posts
bila pelantar runtuh ....die, die die sume
mbhcsf Post at 22-5-2010 15:13


yup..sbb tu penting tahu kesan resonan frequency


biasanya engineer pelantar dh calculate/forumlate jenis bahan yg sesuai
rasenye by experimentally..u can decide which material is the best
cth analogikn gelas sbg bhn buatan pelantar....
kemudian setkan frequency bunyi (sound wave) tertentu yang boleh menyebabkan gelas pecah
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 Author| Post time 22-5-2010 04:01 PM | Show all posts
let me briefly explain the phenomena
Jambatan bergoyang disebabkan "resonance frequency"



Angin: ...
dauswq Post at 22-5-2010 15:06



    wow...thanks dauswq. ni sumer physic la yer....aiyya...lemah sikit bab fizik nih, tu pasal tercengang2 je tadi...mula2 tengok kat berita tadi, ingatkan ada orang wat video palsu ke haper...lepas search kat youtube, baru tau kejadian betul...

kalau sumber gelombangnya angin, boleh dauswq citer skt apa kaitan dengan statement dari user youtube tu : Strong currents in the river caused by the flow of water from melting snow upstream apparently loosened one of the bridge's vertical supports.
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 Author| Post time 22-5-2010 04:03 PM | Show all posts
memang pelik.. aku ingat camera trick... rupanya betul2... perhh... tapi kenapa jalan tak pecah....
totokumngok Post at 22-5-2010 15:01



    aku pun ingat camera trick...
kalau berterusan, jambatan ni boleh roboh...
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Post time 22-5-2010 04:09 PM | Show all posts
wow..kalau ler tengah2 drive, tetiba bergoyang gini...tehumban keta masuk dlm laut..
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Post time 22-5-2010 04:25 PM | Show all posts
wow...thanks dauswq. ni sumer physic la yer....aiyya...lemah sikit bab fizik nih, tu pasal ...
rose_liz Post at 22-5-2010 16:01


maknanya kat sni
aliran deras air sungai boleh menyebabkan gegaran pada tiang jambatan
semakin kuat derasan tersebut, semakin bergegar tiang jambatan, maka tiang akan runtuh
sama ngan explaination psl pelantar minyak tadi
but the theory is not practical sgt


yg plg penting kt snih
kenapa jambatan itu boleh berayun disebabkn "resonan frequency"

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