From what I read on Italian forums, Italian engineers say that the materials that were used to build the bridge weren't the same chosen by the designers.
It will be a while before we learn the actual cause for the collapse, however.
>From what I read on Italian forums, Italian engineers say that the materials that were used to build the bridge weren't the same chosen by the designers.
Care to post a link?
The bridge (actually a long viaduct) has been subject to several overhaulings in the years, including the replacement of some structural parts, though these interventions were largely related to the deck, while - at least from the pictures I have seen - it seems more like a pier collapsed, which is "unusual".
It will be a while before we learn the actual cause for the collapse, however.