11/4/2023 0 Comments Millennium tower san franciscoIn case you ever wondered what the hell those noisy piledrivers are up to. The Concrete Steel Reinforcement Institute’s case study of the building (the Millennium is a concrete-framed building, rather than the more popular steel designs used in most San Francisco buildings) says that the Millennium’s foundations rest on 950 friction piles. Well, intrepid Iowa State University architectural design professor Tom Leslie (who noticed the building’s woes after reading the recent New York Times story) has now explained it via the simplest analogy possible, that of a mere stick. The next question is what kind of design plants a 58-story tower on sand? (Everybody knew the latter point already.) If all goes as planned now, the tower foundation is expected to be extended and supported to bedrock on two sides by this spring.Anyone in San Francisco who has even glanced at the news lately knows three things about the Millennium Tower: That it’s sinking and tilting, that its foundations do not extend to bedrock, and that it’s fantastically expensive. Residents NBC Bay Area talked to said they are still coming to grips with the reality that the tower will likely lean forever. “There's a lot of factors that they have not accounted for,” Williams said. He also worries the tower ended up tilting more than the model predicted last year. “There's a lot of uncertainty,” said David Williams, a deep foundation expert who worries that computer analysis doesn’t specifically simulate the factors that triggered the construction related sinking. But some critics fear that the model’s predictions could be overly optimistic. Investigative Reporter Jaxon Van Derbeken, who has been at the forefront of the investigation for years, has some insight.Ĭity-appointed experts are satisfied with the model’s conclusions, Hamburger said in the statement. San Francisco’s Millennium Tower has been sinking and leaning for years and the final phase of the fix is now underway. Recovery of some of the tilt that has already occurred is a secondary benefit, not a primary objective.” Lead fix engineer Ronald Hamburger said in a statement that the primary objectives “have always been to arrest building settlement at the northwest corner … and stop tilting by transferring a portion of the building’s weight to bedrock. The model projects that once it is secured, the tower will permanently tilt about two feet at the northwest corner. ![]() While the fix was billed as providing some relief, it turns out that the fix engineers’ latest computer model shows the construction project will only offset about 4.5 inches of lean, less than half the roughly ten inches of tilt triggered so far during construction. “If I was a resident, I’d still be worried that I can't put something on the table without it rolling off,” Poulos said. Both times, the marble quickly ran out of steam and came back toward that northwest corner. Recently, a resident videotaped an experiment to show what the tilt looks like on the inside – twice rolling a marble uphill, toward the center of a unit near the corner of the building leaning the most. Sign up for NBC Bay Area’s Housing Deconstructed newsletter. ![]() ![]() Get a weekly recap of the latest San Francisco Bay Area housing news.
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