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