1. Lecturer, Institute of Infrastructure and Environment, The Univ. of Edinburgh, The King’s Buildings, Edinburgh EH9 3JN, UK. E-mail: Tim.Stratford@ed.ac.uk
2. Associate Professor, DISTART, Dept. of Structural Engineering, Univ. of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy. E-mail: giovanni.pascale@mail.ing.unibo.it
3. Consultant Civil Engineer, Manfroni Engineering Workshop (MEW), v. G. Pascoli, 39-Santarcangelo di Romagna, I-47822 Rimini, Italy. E-mail: manfro@iper.net
4. Research Fellow, DISTART, Dept. of Structural Engineering, Univ. of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy. E-mail: barbara.bonfiglioli@mail.ing.unibo.it