1. Master in Construction, Mota-Engil, Engenharia e Construção, S.A., R. Mário Dionísio, no. 2-2799-557 Linda-a-Velha, Portugal.
2. Full Professor, Dept. of Civil Engineering and Architecture, Section of Construction, IST-Technical Univ. of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal (corresponding author).