1. Professor and Head of School, School of Civil, Environmental and Chemical Engineering, Royal Melbourne Institute of Technology Univ., Melbourne 3000, Australia (corresponding author).
2. Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Strathclyde, Glasgow G4 0NG, U.K.
3. Senior Lecturer, Dept. of Civil and Environmental Engineering, Univ. of Strathclyde, Glasgow G4 0NG, U.K.