1. Assistant Professor, Dept. of Civil Engineering, Univ. of Patras, GR-26500, Patras, Greece.
2. Graduate Student, Dept. of Civil Engineering, Univ. of Patras, GR-26500, Patras, Greece.
3. Associate Professor, Dept. of Civil Engineering, Univ. of Patras, GR-26500, Patras, Greece.