General Category > World News
980-foot skyscraper sways in China, prompting panic and evacuations
Wingnut:
--- Quote from: thackney on May 18, 2021, 06:02:56 pm ---Hard to imagine if caused by wind, this was the first time for a 20 year old building.
--- End quote ---
Substandard building materials (steel/concrete) that have degraded over the years.
Just a thought.....
GtHawk:
More quality Chinese building practices like this?
Don't they know better than to use their own steel in a hi-rise tower?
godblessRonaldReagan:
Gojira!
Weird Tolkienish Figure:
Three words: Made in China.
Weird Tolkienish Figure:
Something similar almost happened in the US back in the 70's:
--- Quote ---Citicorp Center's use of bolted joints and the increased loads from quartering winds would not have caused concern if these issues had been isolated from each other. However, the combination of the two findings prompted LeMessurier to run tests on the structural safety.[103] The original welded-joint design could withstand the load from straight-on and quartering winds, but a 75-mile-per-hour (121 km/h) hurricane force quartering wind would exceed the strength of the bolted-joint chevrons.[99] With the tuned mass damper active, LeMessurier estimated that a wind capable of toppling the building would occur on average once every 55 years.[162][161] If the tuned mass damper could not function due to a power outage, a wind strong enough to cause the building's collapse would occur once every 16 years on average.[162] LeMessurier also discovered that his firm had used New York City's truss safety factor of 1:1 instead of the column safety factor of 1:2.[99]
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https://en.wikipedia.org/wiki/Citigroup_Center#Engineering_crisis_of_1978
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