1. Dept. of Civil, Construction and Environmental Engineering, Second Univ. of Naples, Via Roma 29, 81031 Aversa (CE), Italy; formerly, Dept. of Informatics, Infrastructures and Sustainable Energy, Univ. of Reggio Calabria, Via Graziella, Feo di Vito, 89122 Reggio Calabria, Italy.
2. Dept. of Structures for Engineering and Architecture, Univ. of Naples Federico II, Via Claudio 21, 80125 Naples, Italy (corresponding author).