1. Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong, China (corresponding author).
2. Dept. of Civil and Structural Engineering, Hong Kong Polytechnic Univ., Hung Hom, Kowloon, Hong Kong, China.
3. Faculty of Science and Technology, Univ. of Macau Av. Padre Tomás Pereira, Taipa, Macau, China.