1. Ph.D. Student, CESUR, Dept. of Civil Engineering, Instituto Superior Técnico (IST), Technical Univ. of Lisbon, Av. Rovisco Pais 1049-001 Lisboa, Portugal.
2. Assistant Professor, CESUR, Dept. of Civil Engineering, Instituto Superior Técnico (IST), Technical Univ. of Lisbon, Av. Rovisco Pais 1049-001 Lisboa, Portugal.