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
| May 31, 2012
Product Solutions June 2012
Curing agents; commercial faucets; wall-cladding systems.
| May 31, 2012
8 steps to a successful BIM marketing program
It's not enough to have BIM capability--you have to know how to sell your BIM expertise to clients and prospects.
| May 31, 2012
3 Metal Roofing Case Studies Illustrate Benefits
Metal roofing systems offer values such as longevity, favorable life cycle costs, and heightened aesthetic appeal.
| May 31, 2012
AIA Course: High-Efficiency Plumbing Systems for Commercial and Institutional Buildings
Earn 1.0 AIA/CES learning units by studying this article and successfully completing the online exam.
| May 31, 2012
2011 Reconstruction Award Profile: Seegers Student Union at Muhlenberg College
Seegers Student Union at Muhlenberg College has been reconstructed to serve as the core of social life on campus.
| May 31, 2012
2011 Reconstruction Awards Profile: Ka Makani Community Center
An abandoned historic structure gains a new life as the focal point of a legendary military district in Hawaii.
| May 31, 2012
5 military construction trends
Defense spending may be down somewhat, but there’s still plenty of project dollars out there if you know where to look.
| May 31, 2012
New School’s University Center in NYC topped out
16-story will provide new focal point for campus.
| May 31, 2012
Day & Zimmermann taps Jobe for ECM VP
Ken Jobe, a senior executive with 30+ years of industry-related experience, joins Day & Zimmermann to expand footprint in the process & industrial markets.
