1. 1Dipartimento di Ingegneria Strutturale e Geotecnica, Università di Roma “La Sapienza” Via Eudossiana 18, 00184 Roma, Italy; email jacopo.ciambella@uniroma1.it
2. 2School of Electrical, Electronic, and Mechanical Engineering, University College Dublin Belfield, Dublin 4, Ireland
3. 3Department of Mathematics, University of Glasgow, Glasgow G12 8QW, United Kingdom