1. Dept. of Civil Engineering and Architecture, IST-Technical Univ. of Lisbon, Portugal.
2. Civil Engineer, Senior Researcher, National Laboratory of Civil Engineering, Ave. do Brasil 1700-066 Lisbon, Portugal.
3. Full Professor, Dept. of Civil Engineering and Architecture, Section of Construction, IST-Technical Univ. of Lisbon, Ave. Rovisco Pais, 1049-001, Lisbon, Portugal (corresponding author).