1. Postdoctoral Fellow, Ecole Polytechnique Fédérale de Lausanne, IS–BETON, bât. GC, Station 18, CH-1015, Lausanne, Switzerland. E-mail: miguel.fernandezruiz@epfl.ch
2. Professor, Ecole Polytechnique Fédérale de Lausanne, IS–BETON, bât. GC, Station 18, CH-1015, Lausanne, Switzerland. E-mail: aurelio.muttoni@epfl.ch
3. Professor, Politecnico di Milano, DIS, Piazza Leonardo da Vinci 32, I-20133, Milan, Italy. E-mail: pietro.gambarova@polimi.it