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[quote user="Miningman"]Advanced computers and technology.[/quote] Both have a drawback. One gets ever closer to the limits andone doesn't realize it as the software does most of the work. When I started my career computers were in their infancy and I was able to control the results. Today different safety factors for different load cases and different material safety factors for different load cases make checks almost impossible. You overlook a wrong input on don't realize the wrong result Nowadays you are walking on a fine line sometimes. [quote user="Miningman"]The Romans could have built this thing and it would still be there.[/quote]. Yes if they could, but the bridge would have been ten times heavier. And no they were not able to build a bridge with 175' single span, multiple arcs yes. Regars, Volker
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