1. Ph.D. Student, ETH Zurich, Institute of Structural Engineering, Wolfgang-Pauli-Strasse 15, CH-8093 Zurich, Switzerland; and Research Assistant, Empa. Swiss Federal Laboratories for Materials Science and Technology, Structural Engineering Research Laboratory, Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland (corresponding author).
2. Senior Scientist, Empa. Swiss Federal Laboratories for Materials Science and Technology, Structural Engineering Research Laboratory, Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland.
3. Professor, ETH Zurich, Institute of Structural Engineering, Wolfgang-Pauli-Strasse 15, CH-8093 Zurich, Switzerland.