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[quote user="Euclid"]Experts have pointed out the inherent risk from making assumptions about how much re-checking needs to be done when redoing the design and engineering work.[/quote] With today's structural analysis software I see this possible danger much smaller than in the past. Much larger is the danger some intermediate states of construction might have been missed. I read somewhere that jurisdiction ruled that the consulting engineer only owes the analysis for the final state not the intermediates. But I might have misunderstood. In Germany the Fee Structure for Architects and Engineers defines the scope of engineering. Intermediate states have to be contracted additionally. If something went wrong with the analysis of intermediate states of construction, and I say if, that might be a design fault but not necessarily by the primary designer (Figg). [quote user="Euclid"] And the lifting at that location was accomplished with multiple hydraulic rams that were operated independently without automatic equalization.[/quote] Usually multiple hydraulic rams are equalizised. I'd wonder if someone had taken that unnecessary risk. Your theory contains too many ifs and uncertainties to discuss it in detail. So only two questions why did the bridge stand 3 days in its final position before failure if overstressed and why did the bridge survive post-tensioning work at the south end and not the north end? What wonders me is the timing of the final post-tensioning work. For whatever reason this was needed I would have done it while the bridge rested on the transport supports and part of the load transferred to the final supports, longer traffic disturbance or not. But that is hindsight. I believe the building crew felt safe with what and when they did it. As the linked article summed up there is much information needed for a sustainable theory. Without this information there are dozens speculative theories possible. Regards, Volker
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