1. Institute of Concrete Structures, Ruhr Univ. Bochum, Bochum 44801, Germany (corresponding author).
2. Institute of Concrete Structures, Ruhr Univ. Bochum, Bochum 44801, Germany. ORCID: .
3. Professor, Institute of Concrete Structures, Ruhr Univ. Bochum, Bochum 44801, Germany.