1. Ph.D. Candidate, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, 960 Wanjiali South Rd., Changsha, Hunan 410114, China.
2. Associate Professor, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, 960 Wanjiali South Rd., Changsha, Hunan 410114, China (corresponding author).
3. Professor, School of Civil Engineering and Architecture, Changsha Univ. of Science and Technology, 960 Wanjiali South Rd., Changsha, Hunan 410114, China.
4. Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803.