1. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu, Sichuan, P.R. China
2. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu, P.R. China
3. School of Civil Architecture and Civil Engineering, Xihua University, Chengdu, Sichuan, P.R. China
4. POWERCHINA Chengdu Engineering Corporation Limited, Chengdu, P.R. China