1. a School of Civil Engineering , Federal University of Goiás, Praça Universitária , 74605-220 Goiânia, Brazil
2. b Instituto Superior Técnico, Technical University of Lisbon (TULisbon) , Rovisco Pais Avenue, 1049-001 , Lisbon , Portugal E-mail:
3. c Instituto Superior Técnico, Technical University of Lisbon (TULisbon) , Rovisco Pais Avenue, 1049-001 , Lisbon , Portugal E-mail: