1. Graduate Student, Dept. of Engineering and Management, Instituto Superior Tecnico, Univ. of Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal.
2. Full Professor, Dept. of Civil Engineering, Architecture and Georesources, Univ. of Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal.
3. Assistant Professor, Dept. of Civil Engineering and Architecture, Instituto Superior Tecnico, Univ. of Lisbon, Avenida Rovisco Pais, 1049-001 Lisbon, Portugal (corresponding author).