1. Lecturer, Dept. of Civil Engineering and Natural Resources, Univ. of Canterbury, Christchurch 8140, New Zealand (corresponding author).
2. Ph.D. Candidate, Institute of Structural Engineering, ETH Zürich, 8092 Zürich, Switzerland.
3. Professor, Dept. of Civil Engineering and Natural Resources, Univ. of Canterbury, Christchurch 8140, New Zealand.
4. Professor, Institute of Structural Engineering, ETH Zürich, 8092 Zürich, Switzerland.
5. Professor, Dipartimento di Ingegneria Strutturale e Geotecnica, Università La Sapienza, 00184 Rome, Italy; Dept. of Civil Engineering and Natural Resources, Univ. of Canterbury, Christchurch 8140, New Zealand.