1. Associate Professor, Physical Infrastructure Centre, School of Civil Engineering, Queensland Univ. of Technology, G.P.O. Box 2434, Brisbane Queensland 4001, Australia; on leave from Institute of Civil Engineering, Nanchang Univ., Nanchang, Jiangxi 330029, P. R. China.
2. Professor of Structural Engineering, School of Civil Engineering, Queensland Univ. of Technology, G.P.O. Box 2434, Brisbane, Queens-land 4001, Australia.