Influence of quasi-static strain rate on the stress-strain characteristics of modern reinforcing bars

• Quasi-static strain rate effect was experimentally investigated for modern rebars. Tensile strength increased up to 8% in the range of quasi-static rates. A simple model allows predict stress increase based on given Strain limits comparability mechanical properties quality control. can influence results structural tests with corroded While it has been known decades that even loading, increments lead stresses inelastic range, this is often ignored. However, accurate knowledge stress-strain characteristics reinforcing bars an indispensable prerequisite safe design new structures and realistic assessment safety existing ones, dependency steel should thus be accounted many situations. An exemplary case control: Reinforcing produced today are periodically tested check their conformity specifications, determining standard tensile tests. applied rates may vary considerably, but not commonly reported. Hence, subject considerable uncertainty. Another relevant affected by local corrosion reinforcement: Their cross section (and hence, stiffness) varies considerably along bar axis consequently, sections significantly higher than non-corroded sections, leading yield strength. This study investigates stress–strain a comprehensive experimental campaign. In four series experiments, 41 three different types were conducted, applying between 0.004 ‰/s 1.0 ‰/s. Compared static stress, dynamic observed, depending type bar. Based these observations, simplified developed validated against data, showing excellent agreement.