oldtanker: The issue is the "new" design in this bridge, which is the truss system used being concrete with imbedded cables. The most common truss bridges, Pratt or Warren bridges, use steel for the trusses. It is much stronger for its weight than concrete. Also steel is more flexible than concrete. Concrete is ridged for the most part. I do not see how you could "adjust" cables that are embedded in concrete.
Lots of questions on this whole thing. A big one is why would they be adjusting the cables on the main support trusses while traffic was still flowing under the bridge??
I see a lot of odd designed stuff that is made the way it is just to "look" pretty. I think this will come out as a contributing cause in this failure. They could have easily designed a more conventional bridge that would have been stronger/simpler/cheaper but it would have not looked "modern/pretty".
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