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Title |
Evaluation on the Bending Behavior After Yield of RC Beam by Using Image Processing Method(I): Focused on the Compressive Part
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Authors |
김건수(Kun-Soo Kim) ; 박기태(Ki-Tae Park) ; 우태련(Tae-Ryeon Woo) ; 김재환(Jaehwan Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.39 |
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Keywords |
영상분석 기법; 철근콘크리트; 4점 휨 실험; 횡구속 콘크리트 Image processing method; Reinforced concrete; 4 point bending test; Confined concrete |
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Abstract |
As the limit state design method is applied as the design method of reinforced concrete structure, the ultimate state is considered when analysesor designing. In fact, when the reinforced concrete member is bent, there is a confining effect by stirrup, but the material curve of unconfined concretesapplied when designing. In this study, to evaluate the suitability of the confined concrete model for flexural members, a 4-point bending test wasconducted on RC simple beam with a double-reinforced rectangular cross-section, and the behavior of the member after yield was analyzed in detailusing image processing method. For detailed analysis, the DIC method was adopted as an image analysis method, and the validity of DIC methodwas verified by comparing the measurement results with the LVDT. The distribution of the strain on the concrete surface calculated as a result of theDIC method could be obtained, and the average strain distribution of the cross-section was calculated. Using the average strain distribution, the stressdistribution applied existing confined concrete model as a material curve could be derived. Through the comparison of the experimental results andthe existing model application results, the suitability of the confined concrete model for RC flexural members having a rectangular cross-section wasevaluated.
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