1. Ph.D. Student, Dept. of Civil and Environmental Engineering, Tennessee Technological Univ., 1020 Stadium Dr., Prescott Hall 314, Cookeville, TN 38505.
2. Professor, Dept. of Civil and Environmental Engineering, Tennessee Technological Univ., 1020 Stadium Dr., Prescott Hall 216, Cookeville, TN 38505 (corresponding author).
3. Professor, School of Civil Engineering, Tongji Univ., Shanghai 200092, China.