1. École Spéciale des Travaux Publics (ESTP), 94230 Cachan, France
2. James Watt School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK
3. Department of Civil Engineering, Democritus University of Thrace, 671 00 Xanthi, Greece
4. Department of Civil Engineering, Faculty of Engineering Technology, University of Twente, 7522 NB Enschede, The Netherlands