Eshima Ohashi bridge- what is it made of?

hey all.
i saw he Eshima Ohashi bridge and it got me thinking, does anyone know what it is made of( expect concrete of course) . i was wondering if any composite material was used in order to make it. i will be very happy for a answer with a link or reference so i can use it for my studding.


thank you all

Prestressed Concrete has used to make the structure, much stronger than steel reinforced concrete structure.

http://www.smcon.co.jp/hashi-girl/2014/02/07/898/
http://www.pa.cgr.mlit.go.jp/sakai/?page_id=1688
http://www.sakaiminato.net/site2/page/suisan/conents/news/2004/eshima/

Open "PDF" links and use Google translate.
https://goo.gl/c7XrC7
https://goo.gl/7ePtKB
https://goo.gl/aophoa
You can find words "PC = Prestressed Concrete" and "ラーメン(Rahmen in German lang)".
https://goo.gl/us1qxB
https://en.wikipedia.org/wiki/Rigid-frame_bridge
https://goo.gl/fSBg73
https://en.wikipedia.org/wiki/Rigid_frame

This "Rahmen" is NOT famous Japanese noodle "Ramen",
in Japanese lang both writes same "ラーメン", be careful spelling.
https://en.wikipedia.org/wiki/Ramen
Although the writting also saying in Japanese is completely same, but etymology is NOT related.
https://en.wiktionary.org/wiki/Rahmen

ラーメン橋 : Rahmen kyo (Rigid-frame_bridge)

This is for buildings about "Rahmen" vs Wall structured(Kabe shiki = 壁式)" type.
https://youtu.be/gDo-jJzwYVY
https://youtu.be/dDMp_HyqZfY

This is for PC bridge maintenance.
https://youtu.be/smqTDoqwtsY

This is another big bridge of EXPway(toll road) in Wakayama, pref.
https://youtu.be/A02gPQtIEeM
You can understand easier about "PC" is.
Also this is more info about "PC".
https://youtu.be/ykq6Ddoj_jk

And, listen this song "全力の詩" into the rest (after studying).
https://anidb.net/perl-bin/animedb.pl?show=anime&aid=5913