1. Dept. of Sustainable Development and Environmental Engineering, Technical Univ. of Bari, Viale del Turismo 10, 74100 Taranto, Italy (corresponding author). E-mail: g.marano@poliba.it
2. Dept. of Structural Engineering and Geotechnics, Univ. of Rome “La Sapienza,” via Gramsci 53, 00197 Roma, Italy. E-mail: giuseppe.quaranta@uniroma1.it
3. Dept. of Civil Engineering and Architectural Science, Technical Univ. of Bari, Via Orabona 4, 70126 Bari, Italy. E-mail: m.mezzina@poliba.it