The Most Dangerous Building in Manhattan - Veritasium

[TexasTowelie]

Note: From construction images of Citicorp, sharp-eyed viewers might see that the mid-V columns are still there. Those columns help prevent buckling of the diagonal and the weight of people on the floor above, but do not take the majority of the gravity load. So we left them out of our diagram to clearly explain the load paths. See page 70 of this source for more details - https://drive.google.com/file/d/1ODFo...

0:00 Why is the citicorp building on stilts?
4:44 How wind load works
7:49 Tuned Mass Dampers
11:17 The Anonymous Student
14:00 Quartering Winds
18:38 What were the odds of collapse?
20:31 How was the citicorp building fixed?
25:40 Hurricane Ella
27:00 TMDs Take Over The World
28:36 Conspiracies and Cover Ups

[marble falls]

1. I've been reading about this for years, this documentary is the most complete single explanation ...

... I've seen, at least as good as the one I watched on NOVA years ago.

The thing that struck me most with this one is do I believe there is the integrity of REITS, engineers, building officials etc these days to do what these people did to fix a terrible oversight, and I am most certainly do not think so.

I believe this was going on around the same time that another apt fire in the sprinkler devoid Trump Tower killed someone. The Tower has since has some further deaths and fires in residential spaces. Trump uses pooled money (insurance) with other land lords to buy time and prevent making buildings, including ones still on the boards, safer because of higher costs.

I really enjoyed this!

I designed fire rated windows and presented a smoke curtain alternative to smoke lobbies at elevator hoistways to architects and taught a continuing education course to architects in Life Safety on smoke migration through elevator hoistways, and got to be an associate member of NFPA, ICBO and AIA.

[marble falls]

2. One thing I noticed that wasn't in this was a thought that the tower could rotate as it fell in on itself ...

... under the right conditions. I had forgotten how this work was done in the evenings, quietly.

Really good post!!

[IbogaProject]

3. Google doc is gone

Here is the Wikipedia about the issue. The issue was discoveredby two students one at Princeton and an Engineering student un Hoboken when the building was new. Later engineering studies in the 90s say the issue isn't as bad. One issue I notice is the mass damper requires power. The solar up top was not used due to Citibank and Exxon both being the Rockefellers. Maybe using the solar and storage might be a tertiary solution. But crazy to know.