1. Lecturer, School of Architecture and Civil Engineering, Xi'an Univ. of Science and Technology, No.58 Yanta Rd., Xi'an 710054, P. R. China; formerly, Ph.D. Student, Dept. of Bridge Engineering, Tongji Univ., No.1239 Siping Rd., Shanghai 200092, China (corresponding author).
2. Professor, Dept. of Bridge Engineering, Tongji Univ., No.1239 Siping Rd., Shanghai 200092, China.
3. Ph.D. Student, Dept. of Bridge Engineering, Tongji Univ., No.1239 Siping Rd., Shanghai 200092, China.