1. Senior Lecturer, Escola de Engenharia Civil, Univ. Federal de Goiás, Praça Univ., CEP 74605-220 Goiânia-Goiás, Brazil. E-mail: luizacampos@gmail.com
2. Reader, Dept. of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K. E-mail: s.r.smith@imperial.ac.uk
3. Professor, Dept. of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K. (corresponding author). E-mail: n.graham@imperial.ac.uk