1. Civil Engineering Technology Center, Furnas Centrais Elétricas S.A., Goiânia Brazil Rua GV-35, QD-31, LT.27, Residencial Granville, Goiânia, Goiás CEP 74366066, Brazil.
2. Dept. of Civil and Environmental Engineering, Univ. of California, Berkeley, CA.
3. Federal Univ. of Rio Grande do Sul, UFRGS, NORIE, Porto Alegre Brazil.