1. Associate Professor, Dept. of Bridge and Tunnel Engineering, Southeast Univ., Nanjing 210096, China; and Visiting Scholar, Dept. of Civil and Environmental Engineering, Univ. of Pittsburgh, Pittsburgh, PA 15261 (corresponding author).
2. Assistant Professor, Dept. of Civil Structural Engineering, The Hong Kong Polytechnic Univ., Hong Kong, China.
3. Associate Professor, Dept. of Civil and Environmental Engineering, Univ. of Pittsburgh, Pittsburgh, PA 15261.