TheGreenLama - on the III discussion board, 4Alfie.Tx posted a simulation that suggested that the 11-12 base indeed did not stay together, else member 12 would have been pushed to the north. Quote is below
"Meerkat007, your comparison between bridge collapse movie and theoretical simulation of...
To Dik - just for interest value, on the rescue photo you can see the shirt on the lead person says "FLTF1", that's the "Florida Urban Search and Rescue Task Force 1". Same pic in wider format shows a headlamp on the helmet...
A new statement from NTSB: "The investigative team has confirmed that workers were adjusting tension on the two tensioning rods located in the diagonal member at the north end of the span when the bridge collapsed. They had done this same work earlier at the south end, moved to the north side...