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Before the 12-story building suddenly collapsed, corrosion was obvious and documented, resulting in 98 deaths.
The video released by the US Federal Investigation Team shows more evidence that an apartment in the Miami area collapsed in June, causing 98 deaths, extensive corrosion and overcrowded concrete rebar.
The National Institute of Standards and Technology also announced on Wednesday that it will conduct a five-pronged investigation into the collapse of Champlain Tannen, which will be led by Judith Mitrani-Reiser.
Mitrani-Rize said: “We will conduct research with an open mind and will examine all hypotheses that may explain the cause of the collapse.”
“Having a team with extensive experience in the fields of structural and geotechnical engineering, materials, evidence collection, modeling, etc. will ensure a thorough investigation.”
The video shows the dense steel bars in various parts of the building, as well as extensive corrosion at the junction of a column and the foundation of the building.
The firefighters officially ended their Month-long search Corpses in the wreckage of a collapsed apartment building in Surfside, Florida, July 23.
Earlier, investigators investigating the cause of the collapse of the apartment building found evidence Water damage and structural corrosion The owner’s association of this building estimated that it would cost 15 million U.S. dollars to repair it.
“The corrosion at the bottom of that pillar is astronomical,” Dawn Lehman, professor of structural engineering at the University of Washington, told the Miami Herald.
She said that when the building collapsed on June 24, the amount of corrosion should be obvious and recorded as part of the 40-year inspection.
“If there is so much corrosion, this should have been repaired,” she said.
She explained that the images showed that beams, walls and pillars appeared to be overcrowded by steel bars, which indicated a potential weakness.
“There should be no reason for that kind of bar congestion,” Lehman said.
Abieyuwa Aghayere, an engineering researcher at Drexel University, told the newspaper that where the rebar overlaps, the risk of “crowded” vertical rebar in the column will be worse, which is called the “lap splicing” area. .
Aghayere told the Miami Herald that although it is already packed with steel bars, it will be “more crowded” in the splicing area.
He said that he was shocked by the “powder” and white appearance of the pillar concrete in the newly released video. The stone-like aggregates used to reinforce the concrete during construction are usually still visible, but they are not in the image of the collapsed site.
“White shocked me,” Aghayere told the paper. He added, “It’s just homogeneous”, instead of seeing the aggregate mixed into the concrete, this is likely a sign of salt water damage.
He said that the image alone cannot tell whether the concrete used in the original building is weaker than the design requirements, or whether the obvious weakness is due to damage over time.
“To me, it doesn’t look like ordinary concrete,” Aghayere said. “How is this going?”
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