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NIST Names Champlain Tower Investigators

Monday, August 30, 2021

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Last week, the U.S. Department of Commerce’s National Institute of Standards and Technology announced its selection of a team of technical experts to investigate the partial collapse of the Champlain Towers South condominium in Surfside, Florida.

“In response to the tragic events at Champlain Towers South, an accomplished team of experts has answered the call to help us determine the likely cause or causes of the partial collapse,” said James Olthoff, who is performing the nonexclusive functions and duties under the secretary of commerce for standards and technology and the NIST director. “I’m confident this team will work tirelessly to understand what happened in Surfside, and to make recommendations that will improve the safety of buildings across the United States to ensure a tragedy like this does not happen again.”

Collapse Information

Around 1:30 a.m. on June 24, part of the Champlain Towers South was reported to have collapsed. Made of up of three buildings, the towers were each 12 stories tall and contained 342 units.

That same day, more than 80 rescue units were reportedly on the scene. By Sunday, 35 victims were pulled from the structure with two more pulled from the rubble. Eleven of them were treated for their injuries.

A state of emergency was also declared on the day of the collapse, which allowed the Department of Homeland Security and FEMA to coordinate relief efforts at the scene, which also involved containing a fire within the debris. The following Saturday, Gov. Ron DeSantis and Surfside Mayor Charles Burkett turned their attention to the “sister building” to the tower that fell, noting that it was built with the same team. Residents in Champlain Towers North began being aided by FEMA to find temporary housing.

Crews also reported that day that fire had been diminished.

That Sunday, heavy equipment was sent to the scene to help manage the shifting debris after rescuers dug a 125-foot-long trench (20 feet wide and 40 feet deep) to add to the round-the-clock excavation effort.

In later reports, it was determined that the partial collapse had resulted in the death of 98 people.

Tower Background

The complex was built in 1981 by late developer Nathan Reiber and Nattel Construction, which is listed as inactive in state records. Since the collapse, media outlets and the City of Surfside have uncovered documents surrounding the structure’s condition. According to a 2018 engineering report from Morabito Consultants, the condominium had “major structural damage” to its concrete structural slab below the pool deck that needed “extensive repairs.”

At the time of the collapse, consultants also acknowledged that the building was in the early stages of a three-year renovation plan, which had started with roof work about six weeks prior.

NIST Investigation Plans

According to NIST, the technical investigation will be organized around specific projects that will seek to understand the full history of the building, including its design plans, construction, materials, modifications, site and environment, from its design to the moment of collapse.

NIST

Last week, the U.S. Department of Commerce’s National Institute of Standards and Technology announced its selection of a team of technical experts to investigate the partial collapse of the Champlain Towers South condominium in Surfside, Florida.

The investigation team will be headed by Judith Mitrani-Reiser, Associate Chief of the Materials and Structural Systems Division in NIST’s Engineering Laboratory. In her role, Mitrani-Reiser will lead the development and coordination of statutory processes for making buildings safer.

Glenn Bell, Co-Director of the safety organization Collaborative Reporting for Safer Structures, and Co-Founder of the American Society of Civil Engineers' Technical Council on Forensic Engineering, has been assigned to serve as the team’s associate lead.

Other team leads and their projects include:

  • Jim Harris and Jonathan Weigand: Building and Code History;
  • David Goodwin and Christopher Segura: Evidence Preservation;
  • Ken Hover and Scott Jones: Materials Science;
  • Youssef Hashash and Sissy Nikolaou: Geotechnical Engineering; and
  • Jack Moehle and Fahim Sadek: Structural Engineering.

“This team has an incredible amount of experience in forensic engineering, having studied many building failures,” said Mitrani-Reiser. “We are going into this with an open mind and will examine all hypotheses that might explain what caused this collapse. Having a team with experience across a variety of disciplines, including structural and geotechnical engineering, materials, evidence collection, modeling and more, will ensure a thorough investigation.”

Full biographies of the team members and descriptions of each project can be found on the NIST Champlain Towers South investigation webpages here. NIST notes that projects and team members could be added as needed.

Throughout the investigation, the team is slated to provide regular updates on its progress during the investigation, which will include public meetings with the NCST Advisory Committee, annual reports to Congress and progress reports. However, the NIST reports that it will not issue preliminary findings or conclusions before publishing a draft report for public comment.

In early investigations of the collapse, the Miami Herald brought to light that the 12-story condominium tower had had multiple, extensive structural flaws present since the beginning of the building’s life—about 40 years.

Reportedly, the plans that came from a firm that no longer exists specified structural columns that were too narrow to accommodate the necessary amount of rebar to support the building. This meant that contractors had to choose between inadequately attaching floor slabs to supports or putting extra steel into columns that were too small.

Most experts weighing in on the matter chose the latter, which is a recipe for air pockets that accelerate corrosion.

Among the speculation that was looking at how a partial collapse of a patio could have brought down part of a 12-story building, the Washington Post also brought together engineers, construction plans and a computer simulation to come to two main scenarios.

First, if the deck initially collapsed where it joined the building’s facade, that could have overloaded the already-thin columns, causing them to buckle. Second, if the deck remained attached to the columns as it kept collapsing, that would have caused the tugging and twisting on the columns and the surrounding beams, causing them to fall.

Regardless of the final cause, building codes and inspections are already being reformed—with some Miami engineers saying that they have been evaluating 30-50 properties a week.

The Champlain Towers South investigation will be the fifth investigation NIST has conducted using authorities granted by the 2002 National Construction Safety Team (NCST) Act. The Act reportedly gives NIST and its team the primary authority to investigate the site of a building disaster; access key pieces of evidence such as records and documents; and collect and preserve evidence from the site of a failure or disaster.

In addition, the Act also calls for NIST to issue reports and make recommendations to improve building codes and standards.

The NIST investigation into the partial collapse of the Champlain Towers South is projected to take years to complete.

Inspection Spark

Last month, in Miami-Dade County, where the municipality is currently undergoing its 40-year recertification process, officials reportedly displaced hundreds of apartment building residents over safety concerns since the collapse.

According to Miami’s Local 10 News, the collapse caused a ripple effect among residents in condominium buildings who already had maintenance concerns. After many calls and demands for property inspections, some concerns were deemed unfounded and others led to the evacuations.

For example, about 300 residents at Crestview Towers at North Miami Beach were evacuated after officials found a Jan. 11 engineers’ report that warned of safety concerns. A two-story building in South Beach was also evacuated after a flooring system failure and excessive deflection of an exterior wall was found.

Moreover, the collapse in Miami led to structural and inspection concerns throughout the country. Most notably, it renewed worries about San Francisco’s leaning (and sinking) Millennium Tower, forcing professionals to step in and dispel concern.

Khalid Mosalam, a professor of structural engineering at UC Berkeley, went on the record and pointed to the differences in climate between Miami and San Francisco, as well as the age of the buildings and the differences between high- and mid-rise structures, to name a few.

However, there’s no denying that the Millennium Tower needs monitored, particularly as it undergoes its $100 million “fix,” which is slated to be completed next year.

   

Tagged categories: Accidents; Condominiums/High-Rise Residential; Corrosion; Fatalities; Good Technical Practice; Government; Health and safety; NA; NIST; North America; Projects - Commercial; Safety

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