Abstract

The fatigue behavior of reinforcing steel bars (rebars) is significantly influenced by its surface geometry and thus the manufacturing process. As a result of static or dynamic loads, stress concentrations occur at the feet of transverse ribs. Here, the fillet radius has a significant influence on the resulting notch stresses. In addition to the basic surface design, production and process technology have to be controlled in order to increase the fatigue life of reinforcing steels. A laser-based line scan system (LLS system) was used to generate three-dimensional digital geometric twins of the rebars with high accuracy. The resulting surface models were implemented in a finite element method (FEM) program for linear-elastic finite element simulations. Here, areas of high notch stresses were detected at or near the rib feet. These results were compared with the fracture locations of the fatigue tests of the specimens and the local strength.

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