1. Research Associate, COFS, Univ. of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia; formerly, Ph.D. Candidate, School of Civil Engineering, Tianjin Univ., 92 Weijin South Rd., Tianjin, China 300072.
2. Professor, COFS, Univ. of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia. E-mail: mcassidy@civil.uwa.edu.au