1. School of Civil Engineering and Architecture, Wuyi University, Jiangmen, Guangdong, China
2. National Engineering Research Centre on Rail Transit Electrification and Automation (Hong Kong Branch), The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China