1. Proffessor, School of Civil Engineering, Beijing Jiaotong University, Beijing, P. R. China
2. PhD candidate, School of Civil Engineering, Beijing Jiaotong University, Beijing, P. R. China (corresponding author: )
3. Professor, Beijing Municipal Engineering Group Co., Ltd, Beijing, P. R. China
4. Engineer, School of Civil Engineering, Beijing Jiaotong University, Beijing, P. R. China
5. PhD candidate, School of Civil Engineering, Beijing Jiaotong University, Beijing, P. R. China