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
| Jan 6, 2012
Doug Wignall named president of HDR Architecture
HDR Architecture, Inc. is known for its award-winning designs for urban environments, campuses and buildings in the healthcare, science and technology, civic, justice and higher education markets.
| Jan 6, 2012
Gensler unveils restoration and expansion of Houston's Julia Ideson building
The "new" building will serve as a repository of Houston memorabilia and rare archival material as well as the city's official reception space and a venue for exhibits, meetings and other special events.
| Jan 6, 2012
New Walgreen's represents an architectural departure
The structure's exterior is a major departure from the corporate image of a traditional Walgreens design.
| Jan 6, 2012
Summit Design+Build completes Park Place in Illinois
Summit was responsible for the complete gut and renovation of the former auto repair shop which required the partial demolition of the existing building, while maintaining the integrity of the original 100 year-old structure, and significant re-grading and landscaping of the site.
| Jan 4, 2012
Siemens acquires Pace Global Energy Services
Acquisition will enhance portfolio with new energy consulting and management services.
| Jan 4, 2012
Shawmut Design & Construction awarded dorm renovations at Brown University
Construction is scheduled to begin in June 2012, and will be completed by December 2012.
| Jan 4, 2012
Skanska acquires Industrial Contractors
Industrial Contractors Inc. is a contractor in the commercial, industrial and power markets of the Midwest. The company employs 2,400 people and in 2011 the revenues are estimated to be approximately $500 million.
| Jan 4, 2012
HDR to design North America’s first fully digital hospital
Humber River is the first hospital in North America to fully integrate and automate all of its processes; everything is done digitally.
| Jan 4, 2012
New LEED Silver complex provides space for education and research
The academic-style facility supports education/training and research functions, and contains classrooms, auditoriums, laboratories, administrative offices and library facilities, as well as spaces for operating highly sophisticated training equipment.
| Jan 3, 2012
Gilbane awarded $88M Contract for Ohio elementary school construction
The new award, which comprises the construction of five new elementary schools and demolition of 11 older facilities, is the latest K-12 building program managed by Gilbane for the Ohio School Facilities Commission since 1998.
