1. Associate Professor, School of Civil Engineering and Archeology, Changsha Univ. of Science and Technology, No. 960 Wanjiali Rd., Changsha, Hunan 410114, China.
2. Doctoral Student, School of Civil Engineering and Archeology, Changsha Univ. of Science and Technology, No. 960 Wanjiali Rd., Changsha, Hunan 410114, China.
3. Professor, School of Civil Engineering and Archeology, Changsha Univ. of Science and Technology, No. 960 Wanjiali Rd., Changsha, Hunan 410114, China (corresponding author).
4. Associate Professor, Arizona State Univ., Tempe, AZ 85287.