1. Lecturer, Dept. of Civil and Structural Engineering, Dublin Institute of Technology, Bolton St., Dublin 1, Ireland.
2. Ph.D. Researcher, Dept. of Civil and Structural Engineering, Dublin Institute of Technology, Bolton St., Dublin 1, Ireland.
3. Lecturer, Dept. of Civil Engineering, Monash Univ., Clayton, VIC 3800, Australia; formerly, Lecturer, Dept. of Civil and Structural Engineering, Dublin Institute of Technology, Dublin 1, Ireland (corresponding author).