By: KDKA-TV News Staff
PITTSBURGH (KDKA) – The collapse of the Fern Hollow Bridge started at the west end of the structure, as initially reported by the National Transportation Safety Board.
The NTSB’s report was released Monday afternoon and includes more details about the investigation.
Judgment Preliminary Report @NTSB_Newsroom found the broken Fern Hollow Bridge at the west end (Squirrel Hill) of the bridge. The NTSB’s investigation continues in an attempt to determine the reason. @kdka pic.twitter.com/dk6eJujrU9
– Andy Sheehan (@AndySheehankdka) February 7, 2022
The report said:
“The bridge is a “K” continuous, three-span, non-weatherproof steel frame structure with two welded steel beams, welded steel floor beams and coiled steel wire. The ends of the structure rest on reinforced concrete caps on stone-built abutments. Each girder is further supported by two inclined welded steel frame legs, also made of uncoated heat resistant steel, placed atop a reinforced concrete push block. Although certain areas of welded steel beams were identified as severely fractured, no major cracks were found in these areas”.
The investigation will also include an in-depth look at surveillance video recorded from inside the Port Authority bus that was on the bridge when it collapsed.
https://pittsburgh.cbslocal.com/2022/02/07/ntsb-initial-report-pittsburgh-fern-hollow-bridge-collapse/ Initial NTSB report shows Fern Hollow Bridge collapse starting in squirrel hillside – CBS Pittsburgh