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 28, 2011
Armstrong acquires Simplex Ceilings
Simplex will become part of the Armstrong Building Products division.
| Nov 28, 2011
Nauset Construction completes addition for Franciscan Hospital for Children
The $6.5 million fast-track, urban design-build projectwas completed in just over 16 months in a highly sensitive, occupied and operational medical environment.
| Nov 23, 2011
Lord, Aeck & Sargent opens fourth U.S. office, acquiring architecture firm in Austin, Texas
Strategic move offers growth opportunity and strengthens the firm’s historic preservation portfolio.
| Nov 23, 2011
Griffin Electric completes Gwinnett Tech project
Accommodating up to 3,000 students annually beginning this fall, the 78,000-sf, three-story facility consists of thirteen classrooms and twelve high-tech laboratories, in addition to several lecture halls and faculty offices.
| Nov 22, 2011
Corporate America adopting revolutionary technology
The survey also found that by 2015, the standard of square feet allocated per employee is expected to drop from 200 to estimates ranging from 50 to 100 square feet per person dependent upon the industry sector.
| Nov 22, 2011
Report finds that L.A. lags on solar energy, offers policy solutions
Despite robust training programs, L.A. lacks solar jobs; lost opportunity for workers in high-need communities.
| Nov 22, 2011
Saskatchewan's $1.24 billion carbon-capture project
The government of Saskatchewan has approved construction of the Boundary Dam Integrated Carbon Capture and Storage Demonstration Project.
| Nov 22, 2011
New Green Matters Conference examines emerging issues in concrete and sustainability
High-interest topics will be covered in technical seminars, including infrared reflective coatings for heat island mitigation, innovative uses of concrete to provide cooling and stormwater management, environmental benefits of polished concrete, and advancements in functional resilience of architectural concrete.
| Nov 22, 2011
Suffolk Construction selected as contractor for Boston luxury residential tower
Project team breaks ground on 488,000-sf building that will feature world-class amenities.