1. Research Associate, Structural Engineering Institute,Applied Computing and Mechanics Laboratory, Structural Engineering Institute, School of Architecture, Civil and Structural Engineering (IMAC-IS-ENAC), Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland. E-mail: etienne.fest@epfl.ch
2. Lecturer, Engineering Dept., Cambridge Univ., Cambridge, UK. E-mail: ks273@eng.cam.ac.uk
3. Professor, Structural Engineering Institute, Applied Computing and Mechanics Laboratory, Structural Engineering Institute, School of Architecture, Civil and Structural Engineering (IMAC-IS-ENAC), Swiss Federal institute of Technology (EPFL), 1015 Lausanne, Switzerland. E-mail: ian.smith@epfl.ch