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The rod must be long enough to accommodate the nut, when in the untensioned state.bimr said:3) Why does the post tensioning rod nut extend so far into the anchor blister?
saikee said:I don't know about others but I would say the bridge failed because No.11 lost its restraint at the bottom
bmir said:Would you loop the slow motion version that is posted on youtube? The slower speed helps to pick out additional details. It appears to show a white cloud of dust next to the worker and on the side of member #12.
waross said:The rod must be long enough to accommodate the nut, when in the untensioned state.
Additionally there must be enough added length to attach the tensioning jack.
Thank you MikeW7 for that very informative post. An understanding of the nature of the evidence at hand is essential to understanding what it tells us about the events it depicts.MikeW7 said:I'm posting this to provide some background on the original dashcam video
chris snyder said:I used online app (SkyCiv) to analyze forces ...
UKJim said:My estimate for the load on 11 is smaller (see my previous post above). Based on the member sizes in the conceptual design, I calculated a reaction at the north pier of 910 kips (slightly less than the 950 kips in the press accounts).
A portion of this total reaction is the dead weight of half the last span of the base slab and half the last span of the canopy slab. Those forces are not carried by 11.
In addition, the weight of 12 is not carried by 11.
Making those adjustments reduces the unfactored dead load force in 11 to around 1150 kips, plus PT.
Ah yes - I see now looking at overhead when span was being moved. There was question if these were filled when placed - supposedly tensioning [which could be detensioning] was completed the day it was moved, then [tensioning] re-done after cracks appeared. Saikee119 said unsealing blisters would be a big deal and require discussion, etc. Question first arose from seeing small jackhammer in rubble.3D Dave said:Chris - the blister openings were like that before the bridge was transported. The tensioning of all the members would have to happen before lifting the bridge.