Did I Uncover a $100M Mistake with the Millennium Tower “Fix”?

Long video, but I watched it until the advertisement at the end.<p>I don&#x27;t live anywhere near S.F. and my engineering background is limited (undergraduate degree, nothing professional), but I agree that the video author does have a valid and very important concern.<p>It would&#x27;ve been a lot nicer if he shortened the video and if he showed his calculations for the steel bar that the all-thread is transferring the load to.

Watched the video. It&#x27;s very interesting. It has the background information on the sinking Millennium Tower and the pending remedy for it. It describes and analyzes the pending remedy in detail. It&#x27;s worrying that the downward force is hinging on such a small steel plate. It looks like a disaster waiting to happen. It&#x27;s also surprising very little calculation has been submitted by the engineering firm for the proposed remedy. The people involved seem amateur.

Interesting to me is that the potential failure mode this engineer thinks is possible is actually very similar to what caused the Hyatt Regency walkway collapse, <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Hyatt_Regency_walkway_collapse" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Hyatt_Regency_walkway_collapse</a>.

TLDR (IANA engineer):<p>The project to prevent the tower from sinking further, relies on four small steel plates that are supposed to bear a large amount of load. These plates are encased in concrete and therefore cannot be checked or maintained after installation. The video creator can&#x27;t find any evidence that the project engineers calculated whether the plates can bear this load, and his own calculations suggests that they cannot.

I’m surprised that there are no prediction markets going on the Millennium Tower.