1. Department of Civil Engineering, University of the Philippines Los Baños, Laguna 4031, Philippines.
2. Department of Civil and Environmental Engineering, Tokyo Metropolitan University, Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
3. Department of Architecture and Urban Design, Ritsumeikan University, Nojihigashi, Kusatsu, Shiga 525-8577, Japan.