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