What Really Happened at the Millennium Tower?

A video on YouTube. In Science & Engineering, a Krater category.

Summary by Krater

This video examines the engineering failure of the Millennium Tower in San Francisco, which sank and tilted due to settlement issues in the old bay clay layer, and details the retrofitting project designed to fix the foundation.

From the video

Answers: Why is the Millennium Tower sinking and how are engineers fixing it?

Millennium Tower settlement
deep foundation systems
friction piles
soil consolidation
geotechnical engineering
foundation retrofitting
hydraulic jacking

What it concludes

The Millennium Tower sank 16 inches and tilted toward the northwest corner, doubling its anticipated lifetime settlement within a few years of construction.
Comprehensive legal settlement required the condo owners to be compensated and the building to be fixed through foundation retrofits.
The retrofit design installs 52 new perimeter piles tied to the building with hydraulic jacks to transfer weight to the bedrock and halt settlement.

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