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Title |
Evaluation on the Bending Behavior After Yield of RC Beam by Using Image Processing Method(II): Focused on the Tensile Part
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Authors |
김건수(Kun-Soo Kim) ; 박기태(Ki-Tae) ; 우태련(Park) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.6.47 |
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Keywords |
영상분석 기법; 철근콘크리트; 4점 휨 시험; 항복 후 인장강화효과 Image processing method; Reinforced concrete; 4 point bending test; Tension stiffening effect |
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Abstract |
As the limit state design method is applied as a method of designing concrete structures, the ultimate state is considered in the analysis ordesign. In fact, when the reinforced concrete member bears tensile force, the force is transmitted from the rebar to the concrete, and the structure bearsthe tensile force to the ultimate state even after yield. Therefore, the accurate evaluation of behavior after yield, it is necessary to study the tension stiffeningeffect after yield of the flexural member. In this study, a 4-point bending test was conducted on the RC simple beam having a rectangular cross sectionof the double reinforcement, and the behavior of the member was analyzed in detail using the image analysis method. Using the analysis results, theestimation formula for the tension stiffening effect after yield was proposed, and the applicability of this was verified through the experimental resultsof existing study. The difference between the ultimate strain and the yield strain representing the ductile behavior of the member is similar to theexperimental results. The prediction of the proposed formula is relatively accurate.
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