1. Ph.D. Candidate, Dept. of Bridge Engineering, Southwest Jiaotong Univ., Chengdu 610031, China.
2. Professor, Dept. of Bridge Engineering, Southwest Jiaotong Univ., Chengdu 610031, China.
3. Associate Professor, Dept. of Building Materials, Southwest Jiaotong Univ., Chengdu 610031, China (corresponding author).
4. Meredith Professor, Dept. of Civil and Environmental Engineering, Syracuse Univ., Syracuse, NY 13244-1240.