1. Postdoctoral Researcher, Structures Laboratory, Dept. of Civil Engineering, Univ. of Patras, Patra 26504, Greece.
2. Associate Professor, Dept. of Civil Engineering, Univ. of Patras, Patra 26504, Greece (corresponding author).
3. Professor, Dept. of Civil Engineering, Univ. of Patras, Patra 26504, Greece.