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 Minimum Reinforcement Ratio of High Strength Reinforced Concrete Beams According to RCA Replacement Ratio

순환골재 치환률에 따른 고강도 철근콘크리트보의 최소철근비에 관한 실험적 연구

  • 신우철 (금오공과대학교 건축학부) ;
  • 가호경 (금오공과대학교 건축학부) ;
  • 백승민 (금오공과대학교 건축학부) ;
  • 김우석 (금오공과대학교 건축학부) ;
  • 곽윤근 (금오공과대학교 건축학부)
  • Received : 2016.07.16
  • Accepted : 2016.10.21
  • Published : 2016.10.30
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Abstract

In the design of reinforced concrete (RC) beams, the minimum ratio of flexural reinforcement is required to prevent RC member's brittle failure. Of the many influencing factors on the Minimum Reinforcement Ratio (M.R.R), the compressive strength of concrete is one of the main factors contributing to M.R.R Specially, the coarse aggregate type determine compressive strength of concrete. Accordingly, the purpose of this experimental study is to evaluate flexural behavior of high strength RC beams using Recycle Coarse Aggregate (RCA) with the M.R.R specified in the current KBC code. To evaluate the M.R.R, nine RC beam specimens fixed with ${\rho}=0.00395$ were substituted with 0%, 30%, 50% of RCA and were used with 100%, 75%, 50% of M.R.R. The high strength concrete with a 40MPa design compressive strength is used. The test results compared with the theoretical results have a sufficient margin of safety. Although theoretical results compared with the current code calculation results have not enough safety margin when it is M.R.R of 75% and 50%. However, theoretical results compared with the code calculation results have enough safety margin at the M.R.R of 100%.

Keywords

Acknowledgement

Supported by : 금오공과대학교

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