An Approach to Predict Geometrically and Thermo-Mechanically Induced Stress Concentrations in Ribbed Reinforcing Bars
Tobias Robl,
Christoph Hubertus Wölfle,
Muhammed Zubair Shahul Hameed,
Stefan Rappl,
Christian Krempaszky,
Ewald Werner
Affiliations
Tobias Robl
Department of Materials Engineering, Institute of Materials Science and Mechanics of Materials, TUM School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
Christoph Hubertus Wölfle
Department of Materials Engineering, Institute of Materials Science and Mechanics of Materials, TUM School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
Muhammed Zubair Shahul Hameed
Department of Materials Engineering, Institute of Materials Science and Mechanics of Materials, TUM School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
Stefan Rappl
Centre for Building Materials, Department of Materials Engineering, TUM School of Engineering and Design, Technical University of Munich, 81245 Munich, Germany
Christian Krempaszky
Department of Materials Engineering, Institute of Materials Science and Mechanics of Materials, TUM School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
Ewald Werner
Department of Materials Engineering, Institute of Materials Science and Mechanics of Materials, TUM School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
Ribbed reinforcing steel bars (rebars) are used for the reinforcement of concrete structures. In service, they are subjected to cyclic loading. Several studies addressing the relationship between rib geometry, stresses at the rebar surface induced by service loads and the rebar fatigue performance can be found in literature. However, the rebar’s fatigue performance is also influenced by residual stresses originating from the manufacturing process. In this contribution, a modeling approach is proposed to examine geometrically and thermo-mechanically induced stress concentrations in ribbed reinforcing bars made of the steel grade B500B. A linear-elastic load stress analysis and a thermo-mechanical analysis of the manufacturing process are conducted. The results are discussed and compared to literature results. In case of the load stress analysis, the results agree well with findings reported in literature and extend the current state of knowledge for B500B rebars with small diameters. In case of the thermo-mechanical analysis, compressive residual stresses at the rebar surface between two ribs and tensile residual stresses in the longitudinal direction at the tip of the ribs can be reported.
