1. Associate Professor, Dept. of Civil Engineering, Hong Kong Univ. of Science and Technology, CWB, Kowloon, Hong Kong.
2. Professor, Dept. of Bridge Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, P.R. China.
3. Formal Research Assistant, Dept. of Civil Engineering, Hong Kong Univ. of Science and Technology, CWB, Kowloon, Hong Kong.