1. Professor, Dept. of Civil Engineering, Bangladesh Univ. of Engineering and Technology, Dhaka 1000, Bangladesh (corresponding author).
2. Professor, Dept. of Civil Engineering, Chittagong Univ. of Engineering and Technology, Chittagong 4349, Bangladesh.
3. Lecturer, Dept. of Civil Engineering, Dhaka Univ. of Engineering and Technology, Gazipur 1700, Bangladesh.
4. Professor, Dept. of Civil and Environmental Engineering, Saitama Univ., 255 Shimo Okubo, Sakura-ku, Saitama 338-8570, Japan.