1. Ph.D. Candidate, School of Civil Engineering, National Technical Univ. of Athens, 9 Iroon Polytechniou Str. 157 73 Athens, Greece (corresponding author).
2. Associate Professor, Dept. of Construction Engineering and Management, School of Civil Engineering, National Technical Univ. of Athens, 9 Iroon Polytechniou Str. 157 73 Athens, Greece.
3. Professor, Dept. of Geotechnical Engineering, School of Civil Engineering, National Technical Univ. of Athens, 9 Iroon Polytechniou Str. 157 73 Athens, Greece.