1. Engineer, Laboratory for Research on Structural Models, Dept. of Structural Engineering, Ghent Univ., Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium (corresponding author).
2. Professor and Engineer, Magnel Laboratory for Concrete Research, Dept. of Structural Engineering, Ghent Univ., Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium.
3. Professor and Architect, Laboratory for Research on Structural Models, Dept. of Structural Engineering, Ghent Univ., Technologiepark Zwijnaarde 904, 9052 Ghent, Belgium.