1. Assistant Professor, Dept. of Civil Engineering and Architecture, Instituto Superior Técnico, Technical Univ. of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
2. Graduate Student, Dept. of Civil Engineering and Architecture, Instituto Superior Tecnico, Technical Univ. of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
3. Assistant Professor, Dept. Civil Engr. and IMAR-CMA, Faculdade de Ciencias e Tecnologia, Universidade de Coimbra, Pólo II—Rua Luís Reis Santos, 3030-788 Coimbra, Portugal.