1. Research Associate, Dept. of Civil Engineering, Univ. of Bristol, Queen’s Bldg., University Walk, Bristol BS8 1TR, UK (corresponding author).
2. Lecturer, Dept. of Civil Engineering, Univ. of Bristol, Queen’s Bldg., University Walk, Bristol BS8 1TR, UK.
3. Associate Professor, Dept. of Civil and Mineral Engineering, Univ. of Toronto, 35 St. George St., Toronto, ON, Canada M5S 1A4.
4. Reader/Associate Professor, Dept. of Civil Engineering, Univ. of Bristol, Queen’s Bldg., University Walk, Bristol BS8 1TR, UK; Associate Professor, Dept. of Civil Engineering, Aristotle Univ. of Thessaloniki, Thessaloniki 541 24, Greece.