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
| Nov 25, 2013
Electronic plan review: Coming soon to a city near you?
With all the effort AEC professionals put into leveraging technology to communicate digitally on projects, it is a shame that there is often one major road block that becomes the paper in their otherwise “paperless” project: the local city planning and permitting department.
| Nov 22, 2013
Health Product Declaration Collaborative to develop protocol for third-party verification of HPDs
Seven leading product sustainability assessment companies partner with the HPD Collaborative to develop the verification and quality assurance protocols.
| Nov 22, 2013
Kieran Timberlake, PE International develop BIM tool for green building life cycle assessment
Kieran Timberlake and PE International have developed Tally, an analysis tool to help BIM users keep better score of their projects’ complete environmental footprints.
Sponsored | | Nov 20, 2013
Four faces of curb appeal
The Furniture Row retail center in Charlotte, N.C., incorporates four specialty stores in a distinctive, efficient structure.
| Nov 20, 2013
Architecture Billings Index slows in October; project inquiries stay strong
Following three months of accelerating demand for design services, the Architecture Billings Index reflected a somewhat slower pace of growth in October. The October ABI score was 51.6, down from a mark of 54.3 in September.
| Nov 19, 2013
Pediatric design in an adult hospital setting
Freestanding pediatric facilities have operational and physical characteristics that differ from those of adult facilities.
| Nov 19, 2013
Top 10 green building products for 2014
Assa Abloy's power-over-ethernet access-control locks and Schüco's retrofit façade system are among the products to make BuildingGreen Inc.'s annual Top-10 Green Building Products list.
| Nov 18, 2013
USGBC, UL Environment announce joint Environmental Product Declaration
Strategic partnership between U.S. Green Building Council and UL Environment will focus on building materials and product transparency.
| Nov 18, 2013
6 checkpoints when designing a pediatric healthcare unit
As more time and money is devoted to neonatal and pediatric research, evidence-based design is playing an increasingly crucial role in the development of healthcare facilities for children. Here are six important factors AEC firms should consider when designing pediatric healthcare facilities.
| Nov 18, 2013
The builder’s building
Versatility topped Ron Cleveland’s list of priorities when he and his wife decided to construct a new building in Beaumont, Texas, to accommodate the two businesses they jointly own. Cleveland also wanted to create a structure that would serve as an effective marketing tool for his construction firm. An 11,526-sf custom metal office building met both goals.