1. Assoc. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Brasília, 70910-900, Brasília/DF, Brazil.
2. Prof., Dept. of Civ. Engrg., Univ. of Sydney, NSW 2006, Sydney, Australia.
3. Assoc. Prof., Dept. of Civ. Engrg., Univ. of Sydney, NSW 2006, Sydney, Australia.