NIST Report: Video From Expert Team Investigating Surfside Condo Collapse Shows Evidence Of Extensive Corrosion

3 weeks ago 14
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MIAMI (CBSMiami/AP) — It’s been much than 2 months since the Surfside condo collapse killed 98 radical and present caller video released by a squad of national investigators shows much grounds of extended corrosion and overcrowded factual reinforcement successful the building.

The National Institute of Standards and Technology besides announced Wednesday it volition behaviour a five-pronged probe into the Champlain Towers South collapse, which volition beryllium led by Judith Mitrani-Reiser, the subordinate main of the Materials and Structural Systems Division successful NIST’s Engineering Laboratory who grew up successful Miami.

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“This squad has an unthinkable magnitude of acquisition successful forensic engineering, having studied galore gathering failures,” said Mitrani-Reiser. “We are going into this with an unfastened caput and volition analyse each hypotheses that mightiness explicate what caused this collapse. Having a squad with acquisition crossed a assortment of disciplines, including structural and geotechnical engineering, materials, grounds collection, modeling and more, volition guarantee a thorough investigation.”

The video, released by NIST, shows densely packed alloy reinforcement successful assorted sections of the building, on with extended corrosion wherever 1 file met the building’s foundation.

“The corrosion connected the bottommost of that file is astronomical,” Dawn Lehman, a prof of structural engineering astatine the University of Washington, told CBS4 News spouse The Miami Herald. She said that magnitude of corrosion should person been evident and documented arsenic portion of the 40-year inspection that was ongoing erstwhile the gathering successful Surfside, Florida, collapsed June 24.

“If there’s that magnitude of corrosion, this should person been fixed,” she said.

Screen seizure from a video released by the National Institute of Standards and Technology. (Credit: NIST)

The images amusement beams, walls and columns that look to beryllium overcrowded with alloy reinforcement, which suggests imaginable weaknesses, she explained.

“There is nary crushed determination should beryllium that benignant of barroom congestion,” Lehman said.

The hazard posed by “congested” vertical rebar successful columns would person been adjacent worse successful spots wherever the rebar overlapped, which is known arsenic “lap splice” regions, Abieyuwa Aghayere, a Drexel University engineering researcher who besides reviewed the video, told the newspaper.

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While it’s already congested with rebar, astatine the splice regions, it would person been “even further congested,” Aghayere told the Herald.

He said helium was struck by however “powdery” and achromatic the factual successful columns appeared successful the recently released video. Stone-like aggregates utilized to fortify factual during operation typically stay disposable but they were not successful the images from the illness site.

“The achromatic colour conscionable stuns me,” Aghayere told the newspaper. He added that alternatively of seeing aggregate worldly mixed into the concrete, “it’s conscionable homogenous,” which is apt denotation of saltwater damage.

He said it is intolerable to archer from conscionable the images whether the factual utilized successful archetypal operation was weaker than the designs called for, oregon whether the evident weakness was owed to harm implicit time.

“It doesn’t look similar mean factual to me. What’s going on?” Aghayere said.

The NIST’s method probe volition beryllium organized astir circumstantial projects that volition question to recognize the afloat past of the building, including its plan plans, construction, materials, modifications, tract and environment, from its plan to the infinitesimal of collapse.

NIST volition supply regular updates connected its advancement during the probe and is inviting members of the nationalist to taxable immoderate information, including videos, photos oregon different documentation, that mightiness assistance the probe via the NIST Disaster Data Portal.

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(© Copyright 2021 CBS Broadcasting Inc. All Rights Reserved. CBS4 quality spouse The Miami Herald and the Associated Press contributed to this report.)

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