1. Associate Professor, Structural Mechanics Group, School of Civil Engineering, Univ. of A Coruña, 15071 Elvina, A Coruña, Spain (corresponding author).
2. Professor, School of Civil Engineering, Univ. of A Coruña, 15071 Elvina, A Coruña, Spain.
3. Associate Professor, School of Civil Engineering, Univ. of A Coruña, 15071 Elvina, A Coruña, Spain.