[INDUSTRY NEWS]


samples from this area to supplement the core samples we obtained earlier.


• Shipping the core samples along with some recovered rebar and tensioning rods to the Turner Fairbank Highway Research Center, in McLean, Virginia, for testing and evaluation.


• The investigative team has obtained an exemplar tensioning rod and hydraulic unit used by the construction crew to make tension adjustments to the tensioning rods. These items are also being shipped to the Turner Fairbank Highway Research Center for evaluation and testing.


• The larger bridge components the investigative team is removing, are being stored at a secured Florida Department of Transportation facility, under the control of the NTSB. The additional examinations and forensic deconstruction of these components will occur there.


• 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, and had adjusted one rod. They were working on the second


rod when the span failed and collapsed. The roadway was not closed while this work was being performed.


Ongoing work includes:


• Removal of the post-tensioning device to a temporary storage area and preparing it for shipment.


• Preliminary comparison of bridge schematics to measurements obtained during the investigators’ examination of the collapsed structure.


• Interviews with first responders


While segments of the bridge are being transported to and stored at an FDOT facility, there are no plans to reconstruct the bridge as part of the NTSB investigation into why the bridge collapsed. The nature of the structure and the way it failed make reconstruction impractical. The next update on the progress of this investigation will


likely be the preliminary report. Preliminary reports are generally completed within a few weeks following completion of field work. Preliminary reports do not contain analysis and do not address probable cause. y


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