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Scientist: Tae Bo workout sent skyscraper shaking
Seventeen people performing a vigorous Tae Bo workout caused tremors that forced the evacuation of a South Korean skyscraper earlier this month, the building's owners say.
Prime Group, owner of the 39-story TechnoMart commercial-residential high-rise in Seoul, said 17 middle-aged people were working out to the pop song "The Power" by Snap on July 5 when their movements set the upper floors of the tower shaking for 10 minutes, according to a report from the Korea JoongAng Daily.
Scientists recreated the event in the 12th floor gym, according to a report in the Korea Times.
“We observed the vibrometer while performing the same kind of aerobic exercise that was performed at the time of the shaking which occurred on July 5. We noticed that the shaking was felt in the upper floors while the exercise was being performed while no other place showed signs of tremor,” Chung Lan, a professor of architectural engineering at Dankook University, told the Korea Times.
“It just happens to be that the vibration cycle caused by Tae Bo collided with the vertical vibration cycle unique to the building,” Chung told the Korea Times. The action amplified the building's vibration and caused the shaking, he said.
Chung was one of six professors from the Architectural Institute of Korea who inspected the building and recreated the Tae Bo exercise.
Tae Bo is a mixture of boxing and tae kwon do.
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Sparta!
Modern towers are often built "on the cheap" these days. It's not surprising that the World Trade towers collapsed as easily as they did.
Because a Tae Bow exercise and a Jet Liner loaded with 200 people in it crashing into the side of the tower are pretty much the same thing, right?
They didn't collapse easily they got hit (in effect) by 2 cruise missiles loaded with explosives (the fuel in the jets). The driver is the computer the fuel the war head and the people the target. Yep basic cruise missile.
They collapsed because there were thousands of gallons of jet fuel literally melting the support beams after the fire retardant was blown off.
Pretty sure the designers of the original WTC Twin Towers never envisioned fully-fueled jets being DELIBERATELY into them. (A possibility that HAS been taken into account of the heavily-reenforced Freedom Tower).
The phenomenon described here is harmonic resonance; it's why soldiers "break step" when marching across bridges. Doesn't have to caused by human foot-stomping either; Google "Tacoma Narrows Bridge", which was destroyed by resonance inducing swing into the bridge deck at specific wind speeds (should be able to find video of the collapse on YouTube). 😉
Hello Steve Dipschitz,
You are comparing WTC hit by 300MPH jetliners to 17 old people doing the cha-cha? You are really an ACE HOLE.
You, Sir, are an idiot.
Actually, Korean people were impressed by how well the World Trade towers well built when they were hit by jets in 911.
What a stupid statement. How much could 15 Koreans weigh, as opposed to a jet liner loaded with people, their belongings, and jet fuel. Sounds like an even trade-off to me.
@BrickellPrincess
"They collapsed because their support beams had timed explosives installed by a "security" firm owned by the brother of then US President George W. Bush."
Yeah, and I suppose he had them put the explosives there in 1972 when the trade towers were finished so they could detonate them about 30 years later when he had a vision that his brother would be the president and we would be fighting terrorism too.
No most towers in Asia are built with vibration dampeners for earthquake protection.
But either this one didn't have those or if it did, they hit a magic frequency which wasn't engineered well and so it responded by resonating to that frequency. It's either bad engineering or bad planning (no quake dampeners). Either way it should be embarrassing to the South Koreans.
You are a moron.
THIS>>>>>>>>>>>>>>IS>>>>>>>>>>>>>SPARTAAAAAAAAAAAAAAA
Yes, Nicola Tesla did discover he could collapse a building with small vibrations at resonant frequency.
Soldiers break rank when marching across bridges to not hit resonant frequency.
Galloping Gurdy/Gertie (Tacoma Narrows bridge) bridge collapsed due to having a resonant frequency.
Univ of Illinois marching band had to stop playing Indian dance at football games because the people stomping in the upper bleachers caused it to sway.
The wall of Jericho collapsed after Joshua marched the people around the walls.
Walkway at the Hyatt Regency collapsed in 1981–was it in St. Louis?–from people swaying to swing band music.
Looked it up, it was Kansas City, 114 people were lost.
Shake Rattle and Rock & Roll
Now I know how the Jericho walls fell.......
They need to stop making buildings out of cardboard.
Come on...surely this must be Obama's fault, no????
If Obama resonated at the same frequency you could say that.
But Obama only resonates on his own personal frequency that pads his ego.
It grows and grows and grows and like any bubble it's going to burst someday.
Phase two of AL Queada.....Hi-Ya!
Al-Queads next planof attack. Get millions of Asians to do the boogi-woogie at the same time in a city and knock down many buildings ! Yeah, that might work.
CNN has it all wrong: Chuck Norris had a muscle spasm....
There was a similar event when the Twin Towers were being built. before the top was closed off on on of them, a party was given on the top floor. The building shook and swayed. Look what happened to those buildings. I'd stay out of that Koean tower.
"I Got the Power!"
A perfect example of "the resonator" that Deborah Shlian and Linda Reid wrote about in the exciting thriller "Devil Wind".
I would sue the architects for designing such as ridiculous building.
That's called 'Resonance' for those non-scientific types with no science knowledge.
The same forces tore down a bridge in Washington decades ago. It swung higher and higher like a swing in the wind and boom down it came.