From what I've gathered, some engineers said they wouldn't have made the choice themselves, but none have said that choosing to do so was negligent. AFAIU, the Japanese experience, including across multiple severe earthquakes with post hoc analyses and in places much like San Francisco, lent it credibility wrt earthquake resilience.Ĭlearly there's more to understand regarding failure modes and our ability to predict them, but AFAIU the choice was not eye brow raising except, perhaps, among the most conservative engineers. In fact, Japan helped pioneer it in skyscrapers beginning several decades ago, albeit none as tall as the Millennium Tower. But this has become a not uncommon method around the world. Yes, it uses friction piles into soil (far below the landfill) instead of down to bed rock. > it’s a reclaimed landfill!!it’s worse than they are letting the public know (One Market Plaza and 101 California are the only buildings that are heavier. YouTuber Grady Hillhouse, whose channel is called Practical Engineering, suggests that all of this is kind of an experiment - with such tall buildings still relatively new to San Francisco, and, "Our ability to predict how soils will behave under new and extreme conditions isn't perfect, especially when those soils are far below the surface." While Millennium Tower, with its concrete frame, is the third-heaviest building to be constructed in San Francisco coming in at 686 million pounds no other tall buildings in the vicinity had drilled down to bedrock before Millennium Tower was built. Interestingly, Salesforce, which is slightly taller than Millennium Tower, weighs about half as much due to the nature of its construction. A penthouse on the 60th floor of San Francisco's Millennium Tower has hit the market at 14 million. Subsequent construction, including that of the lighter-weight Salesforce Tower, did go down to bedrock with their foundations. Jacob Elliott for Sotheby’s International Realty. (One Market Plaza and 101 California are the only buildings that are heavier.*) So when an engineer recommended concrete piles that only went down to a clay layer, the developers didn't question it. Report claims that after thirty-nine piles of the 52 piles had been installed, something then went seriously wrong. While Millennium Tower, with its concrete frame, is the third-heaviest building to be constructed in San Francisco - coming in at 686 million pounds - no other tall buildings in the vicinity had drilled down to bedrock before Millennium Tower was built. The 100 million fix to the notoriously leaning Millennium Tower is completed, and early results show the encouraging development that it’s already reversed its tilt by, well, an inch.
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