1. Department of Engineering; University of Messina, Contrada di Dio Sant'Agata; Messina 98166 Italy
2. Department of Civil Engineering, Energy, Environment and Materials; University Mediterranea of Reggio Calabria, Salita Melissari; Reggio Calabria 89124 Italy
3. CNR ITAE, Salita Santa Lucia Sopra Contesse, 5; Messina I-98126 Italy
4. CNR-ICCOM, Via G. Moruzzi 1; Pisa I-56124 Italy