1. Associate Professor, Dept. of Structural Mechanics, Univ. of Granada (UGR), Campus Universitario de Fuentenueva, 18072 Granada, Spain.
2. Ph.D. Candidate, Dept. of Structural Mechanics, Univ. of Granada (UGR), Campus Universitario de Fuentenueva, 18072 Granada, Spain (corresponding author).
3. Full Professor, Dept. of Structural Mechanics, Univ. of Granada (UGR), Campus Universitario de Fuentenueva, 18072 Granada, Spain.