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
| Aug 22, 2013
Energy-efficient glazing technology [AIA Course]
This course discuses the latest technological advances in glazing, which make possible ever more efficient enclosures with ever greater glazed area.
| Aug 22, 2013
6 visionary strategies for local government projects
Civic projects in Boston, Las Vegas, Austin, and suburban Atlanta show that a ‘big vision’ can also be a spur to neighborhood revitalization. Here are six visionary strategies for local government projects.
| Aug 22, 2013
The AEC industry needs M&Ms (and we don’t mean the candies)
The other day I asked a group of design and construction professionals if they ever conducted formal post-occupancy evaluations of their completed projects, or even if they just visited them to check out their handiwork. No, they replied, that would be much too risky; besides, clients won’t pay for their time.
| Aug 22, 2013
Warehouse remake: Conversion project turns derelict freight terminal into modern office space [slideshow]
The goal of the Freight development is to attract businesses to an abandoned industrial zone north of downtown Denver.
| Aug 21, 2013
Why research is the ticket to successful airport wayfinding
Wayfinding is more than just signs; it requires a holistic approach based on communicating information that helps people make the right decision at the right time.
| Aug 21, 2013
8 of history’s biggest design blunders
“Learn from the mistakes of others. You can’t live long enough to make them all yourself.” Eleanor Roosevelt’s famous quote rings true when one considers the many failures and resulting lessons learned in the history of architecture, engineering, and design.
| Aug 21, 2013
First look: Petersen Automotive Museum's dramatic facelift
One of the world's largest automotive museums unveils plans for a stunning, sculptured metal exterior and cutting-edge interior upgrades.
| Aug 21, 2013
AIA: Architecture billings on the rise in July
The Architecture Billings Index for July was 52.7, up from a mark of 51.6 in June. This score reflects an increase in demand for design services (any score above 50 indicates an increase in billings).
| Aug 21, 2013
SmithGroupJJR elects six to Board of Directors
SmithGroupJJR, one of the nation’s leading architecture, engineering and planning firms, has named six to join its Board of Directors.
| Aug 20, 2013
40 Under 40 retrospective: ‘U40s’ take on continuing ed, snake’s blood
Every month we’ll be touching base with past 40 Under 40 honorees to see what’s been happening in their professional and personal lives since winning the award. This month: An accomplished author of test-prep books and an architect who headed to China when the American economy turned sour.
