1. Ph.D. Candidate, Dept. of Civil Engineering, Southeast Univ., Nanjing 210096, China; Visiting Ph.D. Student, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, Knoxville, TN 37996.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 313 John D. Tickle Bldg., Knoxville, TN 37996; Visiting Professor, Southwest Jiaotong Univ., Chengdu, China.
3. Professor, Dept. of Civil Engineering, Southeast Univ., Nanjing 210096, China (corresponding author).