1. Associate Professor, Dept. of Civil Engineering, Xi’an Jiaotong Univ., Xi’an 710049, China.
2. Associate Professor, School of Civil Engineering, Central South Univ., 22 Shaoshan South Rd., Changsha 410075, China (corresponding author).
3. Master Student, Dept. of Civil Engineering, Xi’an Jiaotong Univ., Xi’an 710049, China.