[1] Empa, Concrete & Asphalt Laboratory, Dübendorf,CH-8610, Switzerland
[2] École Polytechnique Fédéral de Lausanne (EPFL), ENAC IIE GR-LUD, Lausanne,CH-1015, Switzerland
[3] Paul Scherrer Institute (PSI), ENE LBK CPM, Villigen PSI,5232, Switzerland
[4] NTNU, Department of Structural Engineering, Trondheim, Norway