1. Laboratory of Analysis and Reliability of Offshore Structures, Department of Civil Engineering, Federal University of Rio de Janeiro COPPE/UFRJ, Av. Pedro Calmon, s/n, Rio de Janeiro RJ 21941-596, Brazil e-mail:
2. Professor Laboratory of Analysis and Reliability of Offshore Structures, Department of Civil Engineering, Federal University of Rio de Janeiro COPPE/UFRJ, Av. Pedro Calmon, s/n, Rio de Janeiro RJ 21941-596, Brazil e-mail: