1. Assistant Professor, Dipartimento di Ingegneria Civile e Architettura, Univ. of Pavia, Via Ferrata 3, 27100 Pavia, Italy; Honorary Senior Research Fellow, College of Engineering, Mathematics and Physical Sciences, Univ. of Exeter, Prince of Wales Rd., Exeter EX4 4PL, U.K.; Adjunct Senior Lecturer, School of Civil, Environmental and Mining Engineering, Univ. of Adelaide, Adelaide, SA 5005, Australia (corresponding author).
2. Associate Professor, Dipartimento di Ingegneria Civile e Architettura, Univ. of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.
3. Full Professor, Dipartimento di Ingegneria, Univ. of Ferrara, Via Saragat 1, 44100 Ferrara, Italy.
4. Full Professor, Dipartimento di Ingegneria Civile e Architettura, Univ. of Catania, Viale Andrea Doria 6, 95125 Catania, Italy.