There is a 10-page paper prepared by P. Dilley and K.Taga , titled "Kansai Internationa Airport Terminal". It is published in "Civil Engineer International" , Jan- Febr 1995 edition. I believe CEI is a british magazine, part of the Inst. of Civil Engineers of London.
It may also be in Proceedings of Inst. of Civil Engineers, Civil Engineering, 1995, 108, Feb. 2-11. Paper No. 10556
Civil engineering designer which involved in the project is
a British giant company : Ove Arup and Partners. You may need to contact them to get more info.
Hope that this helps.