1. Sr. Lect., Dept. of Civ. Engrg., Univ. of Western Australia, Nedlands, Australia
2. Research Fellow, Dept. of Civ. Engrg., Univ. of Western Australia, Nedlands, Australia
3. Engr., Public Works Dept., Perth, Australia
4. Prof., Dept. of Civ. Engrg., Univ. of Western Australia, Nedlands, Australia