Any need to worry?

stevej37 · 05-23-2021, 03:19 AM

The SEG Plaza in Shenzhen was reportedly "shaking" on Tuesday afternoon, according to the Chinese city's Emergency Management Bureau on Weibo. There have been no reports of an earthquake around the building, which - at 356 metres tall - is the 72nd tallest in the world. pic.twitter.com/dcO7tHWJUZ
— Hong Kong Free Press HKFP (@hkfp) May 18, 2021

Tobra · Tobra's Garage

I think I heard a fairly large earthquake hit China recently

flatbutt · 05-23-2021, 04:42 AM

and apparently a bad storm killed 21 marathon runners.

stevej37 · 05-23-2021, 05:30 AM

The Tweet says "There have been no reports of an earthquake around the building"
Maybe they said that too early?

rfuerst911sc · 05-23-2021, 05:40 AM

Chinese metal settling ...........

Noah930 · Noah930's Garage

Remember that newly-constructed (still under construction?) high rise that fell over in China a number of years ago?

masraum · 05-23-2021, 06:53 AM

Quote:

Originally Posted by stevej37

The SEG Plaza in Shenzhen was reportedly "shaking" on Tuesday afternoon, according to the Chinese city's Emergency Management Bureau on Weibo. There have been no reports of an earthquake around the building, which - at 356 metres tall - is the 72nd tallest in the world. pic.twitter.com/dcO7tHWJUZ
— Hong Kong Free Press HKFP (@hkfp) May 18, 2021

The good news is that you're fairly unlikely to be affected in MI.

I read a little about that the other day, but not really any more info than what's in this thread. Seems unlikely that we'll get any more info out of China.

red-beard · red-beard's Garage

The issue is the damper. They did not install one. It is probably wind causing the ossillations. I've been reading reports on thisfor a few days.

stevej37 · 10:03 AM

^^^ The damper?? Is that part of an earthquake-proof building?

red-beard · red-beard's Garage

Usually it is designed to reduce oscillations caused by the wind.

stevej37 · 05-23-2021, 10:15 AM

^^^ the article does say that it was very windy that day.

Bill Douglas · 05-23-2021, 11:17 AM

Quote:

Originally Posted by stevej37

^^^ The damper?? Is that part of an earthquake-proof building?

Yes, it's layers of lead and rubber making up the foundations. The idea is to stop the jolt from earthquakes. The building boogies about because the ground is moving, but the sudden stop from the ground moving down the up, or left then right, has been softened.

KevinTodd · 05-24-2021, 04:01 AM

Quote:

Originally Posted by flatbutt

and apparently a bad storm killed 21 marathon runners.

Was reading about this just now. Absolutely horrific.

LEAKYSEALS951 · 05-24-2021, 04:26 AM

Quote:

Originally Posted by Bill Douglas

Yes, it's layers of lead and rubber making up the foundations. The idea is to stop the jolt from earthquakes. The building boogies about because the ground is moving, but the sudden stop from the ground moving down the up, or left then right, has been softened.

You win the internet for using the phrase "The building boogies about."

herr_oberst · 05-24-2021, 05:18 AM

Mike-drop at 2:00

GH85Carrera · GH85Carrera's Garage

Sorry, but I can't work up any tiny amount of worry about the fate of a building in China. It would not be the first of their building to just fall over, or collapse. No doubt it was built with the maximum in speed, and the minimum of safety and engineering.

As a friend of mine often says about a problem that is 100% out of his control; Not my farm, not my pig.

rusnak · 05-24-2021, 06:23 AM

They relaxed a lot of building codes and oversight in order to build so many skyscrapers so quickly. Not that surprising in hindsight.

vash · vash's Garage

damn. that is kinda scary.

however, I am pretty sure there is a tall building south of market, San Francisco that is slowly teetering over. I think the top floor is off to the side 18", last I heard. the condo owners must be pissed. it would suck to get hit with an earthquake with the added eccentricity of a building out of plumb.

stevej37 · 05-24-2021, 07:34 AM

When the camera was shooting at the top of the building....I was expecting to see a big ape on the top.

Pazuzu · 05-24-2021, 08:16 PM

Quote:

Originally Posted by Bill Douglas

Yes, it's layers of lead and rubber making up the foundations. The idea is to stop the jolt from earthquakes. The building boogies about because the ground is moving, but the sudden stop from the ground moving down the up, or left then right, has been softened.

There's an interesting version, which is a big ass swimming pool on the roof. The mass of free water will create a 2-arm pendulum effect, which has a higher frequency but lower amplitude. Eventually the water gets into sync with the building vibrations, but out of phase, thus reducing them. There are a couple of designs, called "tuned mass dampers". I think the swimming pool one ended up being an accident.