1. Graduate School in Research and Engineering (COPPE), Federal Univ. of Rio de Janeiro (UFRJ), Rio de Janeiro, 21941-569 RJ, Brazil.
2. Centrais Elétricas Brasileiras S.A., Eletrobras, Rio de Janeiro, 20040-030 RJ, Brazil.
3. School of Polytechnic, Federal Univ. of Rio de Janeiro (UFRJ), Rio de Janeiro, 21941-909 RJ, Brazil.
4. Military Institute of Engineering, Fortification and Construction Section, Rio de Janeiro, 22291-070 RJ, Brazil.
5. Engineer, Graduate School in Research and Engineering (COPPE), Federal Univ. of Rio de Janeiro (UFRJ), Rio de Janeiro, 21941-569 RJ, Brazil (corresponding author).