1. Associate Professor, School of Civil Engineering, Changsha Univ. of Science and Technology, Changsha, Hunan, China (corresponding author).
2. Graduate Student, School of Civil Engineering, Changsha Univ. of Science and Technology, Changsha, Hunan, China.
3. Professor, Civil Engineering Dept., Univ. of Alaska Anchorage, Anchorage, Alaska.
4. Doctoral Student, School of Civil Engineering, Changsha Univ. of Science and Technology, Changsha, Hunan, China.