1. Research Assistant, KIT Steel & Lightweight Structures, Karlsruhe Institute of Technology, Otto-Ammann-Platz 1, 76131 Karlsruhe, Germany (corresponding author).
2. Professor and Head of Institute, KIT Steel & Lightweight Structures, Karlsruhe Institute of Technology, Otto-Ammann-Platz 1, 76131 Karlsruhe, Germany.