1. Assistant Professor, Dept. di Ingegneria Strutturale (DIS), Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy (corresponding author).
2. Professor, Professor, Institute for Sustainability and Innovation in Structural Engineering (ISISE), Dept. of Civil Engineering, School of Engineering, Univ. of Minho, Azurém, 4800-058 Guimaraes, Portugal.