Abstract
The tensile behaviors of corroded steel bars are important in the capacity evaluation of corroded reinforced concrete structures. The present paper studies the mechanical behavior of the corroded high strength reinforcing steel bars under static and dynamic loading. High strength reinforcing steel bars were corroded by using accelerated corrosion methods and the tensile tests were carried out under different strain rates. The results showed that the mechanical properties of corroded high strength steel bars were strain rate dependent, and the strain rate effect decreased with the increase of corrosion degree. The decreased nominal yield and ultimate strengths were mainly caused by the reduction of cross-sectional areas, and the decreased ultimate deformation and the shortened yield plateau resulted from the intensified stress concentration at the nonuniform reduction. Based on the test results, reduction factors were proposed to relate the tensile behaviors with the corrosion degree and strain rate for corroded bars. A modified Johnson-Cook strength model of corroded high strength steel bars under dynamic loading was proposed by taking into account the influence of corrosion degree. Comparison between the model and test results showed that proposed model properly describes the dynamic response of the corroded high strength rebars.
Highlights
Structure deterioration induced by corrosion of reinforcing bars is one of the major problems in civil engineering
The typical failure modes of the specimens are shown in Figure 9; by comparing the broken section of corroded rebars, it was found that there were no obvious differences in the necking zones among the specimens with the same corrosion degree under the static and dynamic loading
The tensile behaviors of corroded steel bars are important in the capacity evaluation of corroded reinforced concrete structures
Summary
Structure deterioration induced by corrosion of reinforcing bars is one of the major problems in civil engineering. The test results of corroded medium and low strength rebars under dynamic loadings have indicated that the strain rate effect decreased with the increase of corrosion degree [15]. A comprehensive test program is designed to observe, monitor, and evaluate corrosion behavior of corroded high steel bars and its effect on their mechanical properties in concrete under static and dynamic loading. To investigate the impact of corrosion degree on its mechanical properties under dynamic loading, tensile tests were conducted on the corroded high strength rebars by using a high strain rate test system. Based on the test results, reduction factors were proposed to relate the tensile behaviors with the corrosion degree and strain rate for corroded bars and a modified model of Johnson-Cook strength for corroded high strength steel bars under dynamic loading was proposed by taking into account the influence of corrosion. The results produced from the tests can contribute to the body of knowledge of corrosion behavior and its effect on mechanical properties of corroded rebars under dynamic loading, which can be used to predict mechanical behavior of corroded RC structures under impact loading
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