Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
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An Experimental Study on the Size Effect of Reinforced Concrete Beams without Stirrups Using Recycled Coarse Aggregates

전단보강이 없는 순환골재 콘크리트보의 크기효과에 대한 실험적 연구

  • 이호경 (금오공과대학교 건축학부) ;
  • 공효명 (금오공과대학교 건축학부) ;
  • 백승민 (금오공과대학교 건축학부) ;
  • 김우석 (금오공과대학교 건축학부) ;
  • 곽윤근 (금오공과대학교 건축학부)
  • Received : 2015.01.06
  • Accepted : 2015.05.04
  • Published : 2015.05.30
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Abstract

The authors examined the size effect of reinforced concrete(RC) beams using natural coarse aggregates and recycled coarse aggregates. The specimens were made of concrete with a maximum coarse aggregate size of 20 mm. In this study, depth-to-width ratio, shear span-to-depth ratio, tension steel ratio and RCA replacement ratio were fixed 1.5(i.e., h/b=1.5), 3(i.e., a/d=3), 1.2%(i.e., ${\rho}=1.2%$) and 30%(i.e., $R_r=1.2%$) respectively. The test variables only include the RC beam size and aggregate type. A total of 10 simple RC beams were tested under four points loading. It has been shown that shear strength decreases as member size increases. This is associated with a phenomenon called size effect. However, the size of the RC beams does not seem to affect the shear strength proportionally. Besides, test results were analyzed and then compared with the findings and various shear design equations. To conclude, the shear equations reflect relatively well with most of experimental data.

Keywords

Acknowledgement

Supported by : 한국연구재단

References

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