Foundation Repair of San Francisco’s Millennium Tower
San Francisco’s Millennium Tower is a 58-story luxury condominium building developed between 2005 and 2009. Over the next ten years, the structure settled more than 18 inches and tilted a similar amount, resulting in litigation. To address these issues, SGH designed a unique structural upgrade, which involved installing 52 piles along the building’s north and west sides extending to bedrock to arrest further settlement and provide for gradual recovery of tilting. Completed in September 2023, the upgrade has proven effective. In this webinar, we will share an overview of the conditions resulting in the Millennium Tower’s large settlement and tilting, the structural and geotechnical analyses performed, and the retrofit details.
LEARNING OBJECTIVES
After attending this webinar, participants will be able to:
- Understand the reasons for the building’s settlement and tilting.
- Recognize the options available for stabilizing high-rise foundations.
- Discuss the risks of construction adjacent to existing foundations.
- Describe lessons learned from the Millennium Tower’s initial and retrofit designs.
Participants will earn 1 AIA CES Learning Unit (LU/HSW) for attending the live webinar. Registration is free. Please note that space is limited – email events@sgh.com to join our waitlist if the session is closed when you register.
About the Speaker
Ron Hamburger has more the 50 years of structural engineering experience including design, education, failure investigation, and research. He is an internationally recognized expert in performance-based earthquake and force protection engineering and has played an active role on the professional committees that structural provisions of U.S. building codes. He was a member of the federal team that investigated the collapse of New York’s World Trade Center towers following the 9/11 terrorist attacks. He is a past President of the National Council of Structural Engineering Associations, the Structural Engineers Association of California and of Northern California, and the Structural Engineering Certification Board. His awards include ASCE’s Newmark medal and Walter P. Moore awards, and AISC’s Higgins award. A fellow of the Structural Engineering Institute, he is also a member of the National Academy of Engineering.
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