1. MSc in Civ. Engrg., Aboboreiras 44, 2300 Tomar, Portugal.
2. Assoc. Prof., Dept. of Civ. Engrg., IST, Technical Univ. of Lisbon, 1049-001 Lisboa, Portugal.
3. Assoc. Prof., Dept. of Civ. Engrg., Facu. of Sci. and Technol., Univ. of Coimbra, 3030-000 Coimbra, Portugal.
4. Asst. Lect., Dept. of Civ. Engrg., Facu. of Sci. and Technol., Univ. of Coimbra, Coimbra, Portugal.