1. Assoc. Prof., Dept. of Bridge Engrg., Tongji Univ., Shanghai, People's Republic of China.
2. Prof., Dept. of Civ. Engrg., Hong Kong Univ. of Sci. and Technol., Clear Water Bay, Kowloon, Hong Kong, People's Republic of China.
3. Assoc. Prof., Dept. of Civ. Engrg., Hong Kong Univ. of Sci. and Technol., Clear Water Bay, Kowloon, Hong Kong, People's Republic of China.