1. Postdoctoral Researcher, Dept. of Civil, Environmental, and Geomatic Engineering, Swiss Federal Institute of Technology (ETH) Zurich, HIL E35.1, Wolfgang-Pauli-Strasse 15, CH-8093 Zurich, Switzerland (corresponding author).
2. Professor and Chair of Structural Dynamics and Earthquake Engineering, Dept. of Civil, Environmental, and Geomatic Engineering, Swiss Federal Institute of Technology (ETH) Zurich, HIL E14.1, Wolfgang-Pauli-Strasse 15, CH-8093 Zurich, Switzerland.