Investigators from the National Institute of Standards and Technology (NIST) say they have found no evidence of underground voids on the site of the Champlain Towers South collapse, according to a new NIST report.
The team of investigators have studied the site’s subsurface conditions to determine if sinkholes or excessive settling of the pile foundations might have caused the collapse. They have found no such evidence to support that potential cause.
Preliminary evaluation of data indicates about one quarter of an inch or less of settling in the pile foundations supporting the pool deck structure and basement. This would have had minimal impact on the pool deck structure, NIST says.
“Understanding exactly what caused this collapse is taking meticulous investigation and the collection of copious amounts of evidence and information,” said Joannie Chin, director of NIST’s Engineering Laboratory. “Our team members are dedicated to unraveling the complexities of this tragic event, and their rigorous research and analysis will not only help us understand the likely technical cause of the collapse but will improve the safety of our communities.”
The team’s preliminary evaluation of physical and historical evidence found that the pool deck construction deviated from design requirements. Specifically, the number of slab reinforcing bars centered over vertical columns was inadequate, and the reinforcing bars in the top of the slab in the vicinity of the columns were spaced farther apart than the design required, according to investigators. These deviations weakened the slab-column connections, they said.
NIST expects technical work on the investigation to be substantially completed in late June 2024 and aims to release a report with findings and recommendations in late June 2025.
Related Stories
| Feb 1, 2012
ULI and Greenprint Foundation create ULI Greenprint Center for Building Performance
Member-to-member information exchange measures energy use, carbon footprint of commercial portfolios.
| Feb 1, 2012
AEC mergers and acquisitions up in 2011, expected to surge in 2012
Morrissey Goodale tracked 171 domestic M&A deals, representing a 12.5% increase over 2010 and a return to levels not seen since 2007.
| Jan 31, 2012
AIA CONTINUING EDUCATION: Reroofing primer, in-depth advice from the experts
Earn 1.0 AIA/CES learning units by studying this article and successfully completing the online exam.
| Jan 31, 2012
28th Annual Reconstruction Awards: Modern day reconstruction plays out
A savvy Building Team reconstructs a Boston landmark into a multiuse masterpiece for Suffolk University.
| Jan 31, 2012
Chapman Construction/Design: ‘Sustainability is part of everything we do’
Chapman Construction/Design builds a working culture around sustainability—for its clients, and for its employees.
| Jan 31, 2012
Fusion Facilities: 8 reasons to consolidate multiple functions under one roof
‘Fusing’ multiple functions into a single building can make it greater than the sum of its parts. The first in a series on the design and construction of university facilities.
| Jan 31, 2012
Suffolk Construction to manage Lawrence & Memorial Hospital Cancer Center project in Waterford, Conn.
Leading construction management firm overseeing one of first healthcare projects in the country to utilize innovative IPD process.
| Jan 31, 2012
Perkins Eastman’s Miller appointed Chairman of the AIA International Committee
International expertise leveraged as global industry resource.
| Jan 31, 2012
KBE selected for school project in Waterbury, Conn.
Located adjacent to the existing elementary school, the $28 million, 82,000 s/f Pre-K to eighth Grade school is expected to host its first students in the fall of 2013.
| Jan 31, 2012
Construction Law Firm Allensworth & Porter, LLP adds May to the firm
Prior to joining Allensworth & Porter, May served as the staff attorney for the Texas Civil Justice League, and was responsible for drafting, analyzing, and tracking civil justice and business-related legislation during the 82nd Legislative Session.
