1. School of Civil Engineering, Central South University, Changsha, China
2. National Engineering Laboratory for High Speed Railway Construction, Changsha, China
3. Department of Civil, Structural and Environmental Engineering, University at Buffalo-The State University of New York, Buffalo, NY, USA
4. Department of Civil Engineering, Penn State Harrisburg, Middletown, PA, USA
5. Railway Engineering Research Institute, China Academy of Railway Sciences, Beijing, China