1. School of Engineering, Computer Science and Mathematics, University of Exeter, North Park Road, Exeter, EX4 4QF, United Kingdom, (E-mail: S.Djordjevic@exeter.ac.uk; D.Savic@exeter.ac.uk)
2. Faculty of Civil Engineering, University of Belgrade, P.O. Box 42, 11120 Belgrade, Serbia and Montenegro, (E-mail: eprodano@hikom.grf.bg.ac.yu; marko.ivetic@hikom.grf.bg.ac.yu)
3. Department of Civil and Environmental Engineering, Imperial College, Imperial College Road, London, SW7 2AZ, United Kingdom, (E-mail: c.maksimovic@imperial.ac.uk)