1. Assistant Professor, Dept. of Civil Engineering, Central South Univ., Changsha, Hunan 410075, China; Postdoctoral Associate, Dept. of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, Piscataway, NJ 08854.
2. Associate Professor, Dept. of Civil and Environmental Engineering, Rutgers, State Univ. of New Jersey, Piscataway, NJ 08854 (corresponding author).
3. Associate Professor, Dept. of Civil Engineering, Central South Univ., Changsha, Hunan 410075, China.
4. Professor, Dept. of Civil Engineering, Central South Univ., Changsha, Hunan 410075, China.