1. Postdoctoral Fellow, College of Design, School of Building Construction, Georgia Institute of Technology, 280 Ferst Dr., Atlanta, GA 30332-0680.
2. Professor, 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 (corresponding author).
4. Professor, Dept. of Civil and Environmental Engineering, Hole School of Construction Engineering, Univ. of Alberta, 5-047 Markin/Canadian Natural Resources Limited and Natural Resources Engineering Facility, Edmonton, AB, Canada T6G 2W2.