I donβt recall what your engineering background is, but you may find this interesting. I know I mentioned earlier that the collapse reminded me of the ship impact related collapse of the Sunshine Skyway Bridge collapse in 1980. I remember several papers being presented at the International Bridge Conference in the early, mid 80βs about that incident.
This link is to the NTSB investigation and report on that collapse.
https://www.ntsb.gov/investigations/AccidentReports/Reports/MAR8103.pdf
NTSB will be doing the same thing for this investigation. It took them about 10 months to complete that report. Unfortunately, the construction of the Key Bridge predates some of the recommendations to address ship impact possibilities.