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Photo illustration shows women attending an aerobic class. South Korean
experts said Tuesday they believe a vigorous gym exercise session caused a
high-rise building in the capital to shake for 10 minutes this month, prompting
hundreds to flee in panic。
South Korean experts said Tuesday they believe a vigorous gym exercise
session caused a high-rise building in the capital to shake for 10 minutes this
month, prompting hundreds to flee in panic。
They said tests showed that oscillations created by a group of Tae Bo
practitioners on the 12th floor of the 39-story TechnoMart mall building
apparently resonated through the structure。
Tae Bo is an aerobic exercise routine that involves performing the motions
of boxing and martial arts such as Taekwondo at a rapid pace。
Professor Chung Lan of Danguk University in Yongin City near Seoul linked
the incident to a physics principle under which catastrophic failures can occur
when the vibration of a structure is matched by another source。
He told a radio programme that the building, constructed from iron girders
and cement, had a characteristic vibration frequency which was "in phase" with
the synchronised movements of the Tae Bo practitioners。
Chung and six others re-created the scenario which caused the panic on July
5 -- with a group of 17 middle-aged people working out to the tune of a pop
song, "The Power" by German group Snap -- and said the building shook in a
similar way。
On the first occasion hundreds fled the building as it shook for about 10
minutes. The Gwangjin district government ordered the mall closed but reopened
it after experts said it was structurally sound。
The gym remains off-limits。
Cho Byung-Joon, chief of the district government's flood control and
disaster prevention division, said the professor and other experts would carry
out a test before news media and officials later Tuesday to prove their
theory。
"When they show the test results to us and with data, we will immediately
let people use the fitness club," he told AFP. "But practising Tae Bo in that
particular building may have to be banned." |
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发表于 2016-7-10 17:33:49