1. Member, ASCE
2. Prof., Dept. of Civ. and Struct. Engrg., Hong Kong Polytechnic Univ., Hong Kong, People's Republic of China. E-mail: ceysli@polyu.edu.hk
3. Assoc. Prof., Dept. of Appl. Mech. and Engrg., Zhongshan Univ., Guangzhou, People's Republic of China.