1. Senior Researcher, Steel Research Laboratory, JFE Steel Corporation, 1, Mizushima-kawasaki-dori, Kurashiki 7128511, Japan (corresponding author).
2. Senior Researcher, Steel Research Laboratory, JFE Steel Corporation, 1, Mizushima-kawasaki-dori, Kurashiki 7128511, Japan.
3. Senior Researcher, Steel Research Laboratory, JFE Steel Corporation, 1-1, Minamiwatarida-cho, Kawasaki-ku, Kawasaki 2100855, Japan.
4. Lecturer, Faculty of Civil Engineering, Ho Chi Minh City Univ. of Technology, Ho Chi Minh 740128, Vietnam.
5. Professor, Dept. of Civil and Environmental Engineering, Nagaoka Univ. of Technology, Nagaoka 9402188, Japan.