Foto documentation: August 14, 2018 *Update*

- I included a number of additional images dating August 8, 2015,
   adding to those from 2007 further below this page.
- Information for media distribution:
    The images below (800x600px) may be freely used in any way,
    as long as the author "Kristian Hasenjäger" is mentioned
     and the inscription "www.retrofutur.org" remains visible.
- I document and research the history of this bridge since 2007. 
- For any inquiries, please feel free to email "skyhook@aon.at"
- For high quality hi-res images and video clips, please contact "skyhook@aon.at".
- Click on the gray square icon (next to the orange title right above)  to view all images on a single page.

Peculiarities of the Polcevera bridge - quick overview:

• The peculiarity of this bridge (opened in 1967) may be seen in the configuration of the three 90m high A-type pylons, one of which collapsed on August 14, 2018.
• Each of the three A-type pylons supports a statically fixed bridge table section through four cable stays
• A set of steel cable stays is channelled inside the (visible) concrete beams. The cables were prestressed at construction time, so that the concrete beam around it remains always under a certain compression. This may be less prone to oscillations than a steel-only cable stay configuration, and reduce stress on the cables. However, because of its weight, extension and slim cross-section, the beams behave more like flexible catenaries than rigid beams.
• Since the 1980ies, the bridge has been continuously and thoroughly monitored.
• Preliminary checks had brought to light a worrisome situation, manifested by the presence of cavities and degradations in the concrete, especially at the fixation point of the prestressed cable stays
• Especially the section which passes over highly urbanized area has been strengthened 1993 and onwards (see dedicated photos below).