전단보강이 없는 순환골재 콘크리트보의 크기효과에 대한 실험적 연구

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이호경;공효명;백승민;김우석;곽윤근
Lee, Ho-Kyung;Gong, Hyo-Mung;Baek, Seung-Min;Kim, Woo-Suk;Kwak, Yoon-Keun

  • 투고 : 2015.01.06
  • 심사 : 2015.05.04
  • 발행 : 2015.05.30

초록

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.

키워드

순환골재;건설폐기물;순환골재 치환율;전단 강도;크기효과

참고문헌

  1. Yang, K. H., Eun, H. C., & Jung, H. S. (2001). The prediction on the shear strength of reinforced concrete deep beams included size effect. Journal of the Architectural Institute of Korea, 17(12), 35-44.
  2. Bazant, Z. P., & Kazemi, M. T. (1991). Size effect on diagonal shear failure of beams without stirrups. ACI Structural Journal, 88(3), 268-276.
  3. Park, K. H., & Yeom, D. W. (1996). Size effect on the shear strength of high strength reinforced concrete short beams without stirrup. Journal of the Architectural Institute of Korea, 16(2), 529-536.
  4. Park, S. S., & Roh, J. W. (2005). An Experimental Study on the Strength of Shear Capacity of the Reinforced Concrete Deep Beam. Department of Architectural Engineering, Pusan National University.
  5. Rios, R. D., & Riera, J. (2004). Size effects in the analysis of reinforced concrete structures. Engineering Structures, 26, 1115-1125. https://doi.org/10.1016/j.engstruct.2004.03.012
  6. Tan, K. H., Kong, F. K,. Teng, S., & Guan, L. (1997). High-strength concrete deep beams with effective span and shear span variations beam. ACI Structural Journal, 94(5), 572-582.
  7. Taylor, H, P. J. (1972). Shear strength of large beam. Journal of the Structural Division, Proceedings of the ASCE, 98(11), 2473-2490.
  8. Walraven, J., & Lehwaliter, N. (1994). Size effect in short beams loaded in shear. ACI Structural Journal, 91(5), 585-593.

과제정보

연구 과제 주관 기관 : 한국연구재단