1. Ph.D. Student, Dept. of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China; Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2; Dept. of Civil Engineering, Zhejiang Univ., Hangzhou 310058, China (corresponding author).