1. Graduate School of Engineering, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
2. Research Center for Disaster Mitigation of Urban Cultural Heritage, Ritsumeikan University, 56-1 Toji-in Kitamachi, Kita, Kyoto 603-8577, Japan
3. Mitsubishi Heavy Industries, 1-1-1 Wadasaki, Hyogo, Kobe 652-8585, Japan