1. Takenaka R & D Institute Takenaka Corporation Inzai‐shi Chiba Japan
2. Structural Engineering Section, Design Department, Nagoya Branch Office Takenaka Corporation Nagoya‐shi Aichi Japan
3. School of Human Science and Environment University of Hyogo Himeji‐shi Hyogo Japan
4. National Institute for Materials Science Tsukuba‐shi Ibaraki Japan
5. Materials Manufacturing and Engineering Station National Institute for Materials Science Tsukuba‐shi Ibaraki Japan
6. R & D Group Awaji Materia Co., Ltd. Chiyoda‐ku Tokyo Japan