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Oak Island Bridge Collapse

Oak Island Bridge Collapse

RE: Oak Island Bridge Collapse

Apparently the girder was suspended at the splice with a strongback system overhead.  High strength hanger bars were welded at couplers, which compromised the strength of the bars. The bars snapped.

RE: Oak Island Bridge Collapse

(OP)
It appears from the photos forwarded to me that the rebar was just tack welded at the couplers. Hard to believe that tack ate up all the safety factor.

I think something else was at work - the other hangers from the first girders set didn't fail.
 

RE: Oak Island Bridge Collapse

JLNJ,

I haven't seen any photos, but tack welds on high strength steel do a lot more damage than just decreasing the area.

RE: Oak Island Bridge Collapse

How do those couplers work? Are they threaded, or is the weld the only thing holding them?  

RE: Oak Island Bridge Collapse

JLNJ,

It depends on the chemistry of the bars, but tack welding on some types of high strength bars can cause embrittlement, and the tack weld creates a stress riser, essentially destroying the bar.

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