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Here is a photo of the intact Polcevera Viaduct: <a href="https://upload.wikimedia.org/wikipedia/commons/c/c6/Genova-panorama_dal_santuario_di_ns_incoronata3.jpg">https://upload.wikimedia.org/wikipedia/commons/c/c6/Genova-panorama_dal_santuario_di_ns_incoronata3.jpg</a> And here one of the collapsed bridge. <a href="https://media1.faz.net/ppmedia/aktuell/1627041056/1.5737697/media_in_article_medium/54795030.jpg">https://media1.faz.net/ppmedia/aktuell/1627041056/1.5737697/media_in_article_medium/54795030.jpg</a> The left pylon and the adjacent bridges are missing. If you look at the first photo you see less high bridges in both adjacent spans. These rest on the parts on bridge plates that are supported by the stays via gerber joint. If these less high bridge plates collape, I'd expect no consequences for the collapsed pylon. But I could be wrong if the missing weight of the less high bridge leads to a large imballance that the pylon can not withstand. Collapsed are the pylon with is stay supported bridges and two less high bridges. The following video shows a bit unclear the pylon collapsing at 0:11. Interesting at that moment is, that the less high bridge is already missing. <a>https://youtu.be/5NGbdpv1mSw</a> I only try to understand the structural design of the bridge and what happened. There is no chance to say why it happened. There is too much information missing. I don't think that the pylon foundation collapsed due to scouring. Here are photos of pylon's lower end. <a href="http://www.heute.at/2010/img/diashow_html5/1x1.gif">http://www.heute.at/2010/img/diashow_html5/1x1.gif</a> <a href="http://www.heute.at/2010/img/diashow_html5/1x1.gif">http://www.heute.at/2010/img/diashow_html5/1x1.gif</a> <a href="http://www.heute.at/2010/img/diashow_html5/1x1.gif">http://www.heute.at/2010/img/diashow_html5/1x1.gif</a> Looks like the pylon broke about 60'+ above the pier. Regards, Volker
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