1. Members, ASCE
2. Res., Dept. of Civ. and Build. Engrg., Loughborough Univ., Loughborough, Leicestershire, LE11 3TU U.K.
3. Prof. and Sr. Pro-Vice-Chancellor, Dept. of Civ. and Build. Engrg., Loughborough Univ., Loughborough, Leicestershire, LE11 3TU U.K. E-mail: R.McCaffer@lboro.ac.uk