1. Ph.D. Candidate, School of Civil Engineering, Changsha Univ. of Science and Technology, No. 960, Section 2, Wanjiali South Rd., Changsha, Hunan 410114, China.
2. Ph.D. Candidate, School of Civil Engineering, Changsha Univ. of Science and Technology, No. 960, Section 2, Wanjiali South Rd., Changsha, Hunan 410114, China (corresponding author).
3. Distinguished Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., 3230D Patrick Taylor Hall, Baton Rouge, LA 70803.
4. Professor, School of Civil Engineering, Changsha Univ. of Science and Technology, No. 960, Section 2, Wanjiali South Rd., Changsha, Hunan 410114, China.
5. Professor, School of Civil Engineering, Changsha Univ. of Science and Technology, No. 960, Wanjiali South Rd., Changsha, Hunan 410114, China.