1 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. Electronic address: amytgy@gmail.com.
2 Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. Electronic address: phlee@polyu.edu.hk.
3 Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong. Electronic address: kshih@hku.hk.