1. Professor, Division of Structural Engineering, Lund Univ., Lund 22100, Sweden.
2. Assistant Researcher, Dept. of Civil, Environmental, and Mechanical Engineering, Univ. of Trento, Trento 38123, Italy.
3. Assistant Professor, Dept. of Civil, Environmental, and Mechanical Engineering, Univ. of Trento, Trento 38123, Italy (corresponding author).