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
| Jun 6, 2012
KPF designs tower for Yongsan IBD
The master plan, created by Studio Daniel Libeskind, is a dynamic urban environment containing contributions from 19 different architects practicing in diverse locations around the globe.
| Jun 6, 2012
SOM urges Chicago tenants to partner with landlords to cut energy use
Tenants can exceed building energy challenge targets recently announced by Mayor Emanuel.
| Jun 6, 2012
KLMK Group awarded contract with Parkland Health & Hospital System in Texas
KLMK will also provide planning guidance in all aspects of the project related to facility activation.
| Jun 5, 2012
Cannon Design joins forces with Peter Ellis New Cities
Peter Ellis will now lead Cannon Design's urban planning and city design practice in collaboration with the firm's executive leadership.
| Jun 5, 2012
Walker Parking opens office in Abu Dhabi
Walker has been in Abu Dhabi since May 2011 but in a temporary office suite.
| Jun 5, 2012
Glumac hires Drit Shoemaker as new director of business development
Shoemaker will research, connect, and forge new client relationships with architects, developers, owners and brokers while strengthening relationships with current clients.
| Jun 5, 2012
Hoffman Architects Arbuckle elected president of New York/Tri-State DOCOMOMO
As chapter president, Arbuckle will guide and oversee the organization's efforts on behalf of Modern buildings and sites, and he will act as the main spokesperson for the organization.
| Jun 4, 2012
Brownfield goes green
Chicago Center for Green Technology uses high-speed, energy-efficient hand dryers to share its green message and earn LEED credits.
| Jun 4, 2012
KBE Building and CTA Construction awarded Project of the Year from CMAA
Award given for work done on the renovation of Beverly High School in Beverly, Mass.
| Jun 4, 2012
Pressley promoted to Senior VP and CIO at Hill International
Pressley will be responsible for managing all of Hill's information technology systems and software worldwide.
