1. Assistant Professor, Dept. of Civil Engineering, Gokongwei College of Engineering, De La Salle Univ., 2401 Taft Ave., 1004 Manila, Philippines (corresponding author).
2. Professor, Dept. of Civil Engineering, Gokongwei College of Engineering, De La Salle Univ., 2401 Taft Ave., 1004 Manila, Philippines.
3. Professor, Dept. of Mechanical and Environmental Informatics, Graduate School of Information Science and Engineering, Tokyo Institute of Technology, 2-12-1, W8-22, O-Okayama, Meguro-ku, Tokyo 152-8552, Japan.
4. Professor, Dept. of Civil and Environmental Engineering, Graduate School of Science and Engineering, Ehime Univ., 3 Bunko, Matsuyama, Ehime 790-8577, Japan.