1. Professor, Dept. of Civil Engineering, Aristotle Univ., Thessaloniki 54124, Greece (corresponding author).
2. Professor, Dept. of Civil Engineering, Aristotle Univ., Thessaloniki 54124, Greece.
3. Assistant Professor, Dept. of Civil Engineering, Aristotle Univ., Thessaloniki 54124, Greece.
4. Civil Engineer, Dept. of Civil Engineering, Aristotle Univ., Thessaloniki 54124, Greece.