1. Research Associate, Dept. of Architecture, Univ. of Cambridge, Cambridge CB2 1PX, U.K. (corresponding author).
2. Ph.D. Candidate, Dept. of Architecture and Civil Engineering, Univ. of Bath, Bath BA2 7AY, U.K.
3. Reader in Civil Engineering, Dept. of Engineering, Univ. of Cambridge, Cambridge CB2 1PX, U.K.
4. Professor, Dept. of Architecture and Civil Engineering, Univ. of Bath, Bath BA2 7AY, U.K.
5. Former Senior Lecturer, Dept. of Engineering, Univ. of Cambridge, Cambridge CB2 1PZ, U.K.
6. Reader, Dept. of Architecture and Civil Engineering, Univ. of Bath, Bath BA2 7AY, U.K.
7. Senior Lecturer, Dept. of Architecture and Civil Engineering, Univ. of Bath, Bath BA2 7AY, U.K.