1. Associate Professor, CIEC, Dept. of Civil Engineering, Univ. of Coimbra-Polo II-Rua Luís Reis Santos, 3030-788 Coimbra, Coimbra, Portugal (corresponding author).
2. Civil Engineer, Univ. of Coimbra-Polo II-Rua Luís Reis Santos, 3030-788 Coimbra, Coimbra, Portugal.
3. Associate Professor, DECivil/LABEST, Univ. of Aveiro, Aveiro, Portugal.