1. Postdoctoral Research Fellow, Dept. of Civil and Environmental Engineering, Hole School of Construction Engineering, Univ. of Alberta, 5-047 Markin/CNRL NREF, Edmonton, AB, Canada T6G 2W2.
2. Professor, School of Civil Engineering and Mechanics, Huazhong Univ. of Science and Technology, Wuhan, Hubei 430074, China (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Maryland, College Park, MD 20742-3021.