1. Faculty of Architecture, Dept. of Architecture, Technical Univ. of Lisbon, R. Sá Nogueira, Pólo Universitário, Alto da Ajuda, 1349-055 Lisboa, Portugal (corresponding author).
2. Dept. of Civil Engineering and Architecture, Instituto Superior Técnico, Technical Univ. of Lisbon, Av. Rovisco Pais, 1049-001 Lisboa, Portugal.