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[quote user="Euclid"]I would think it would be ideal to carry equal loading on all of the truss span support points during the entire move.  Also, it would seem essential throughout the lift, move, and set-down, to maintain the exact bridge deck plane that will exist once it is in place.  So the support cylinders would adjust elevation as needed to conform to uneven elevation in the road surface. [/quote] This is taken care for by the SPMTs. They can be programmed that the bridge's plane doesn't change even when crossing a median. [quote user="Euclid"]How was it determined that the cracking did not pose a safety hazard?  How was it determined that the cracking was not “a sign of deeper trouble” as the article mentions as being a possibility with observed cracking?  It seems to me that since this cracking was formally acknowledged as a possible sign of structural danger, there would have to be a clear explanation of how this was found not to be the case.  [/quote] First, by definition, concrete is a material that can crack under load because of its low tensile strength. Therefore it gets reinforced with steel. The calculation is done with a tensile strength =0. So cracks are daily business for concrete designers.  To determine how problematic a crack is you need to know the structural analysis and have a lot of experience. I don't see an easy way to explain the reasoning behind cracks to laymen without going deep into concrete design. If I would read such an explanation, why this particular crack is not dangerous, I would have to believe it. Without knowing the dimensioning and not having seen the crack and its location personally I see no chance to judge the conclusions. Regards, Volker Edit: Sentence in Italics added to clarify the reference
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