The Estimation on the Stirrup Effectiveness of Reinforced High Strength Concrete Beams

고강도 철근콘크리트 보에서 스터럽 유효성의 평가

  • 김진근 (한국과학기술원 토목공학과) ;
  • 박찬규 (한국과학기술원 토목공학과) ;
  • 이영재 (상주산업대학교 토목 공학과) ;
  • 서원명 (경상대학교 농공학과)
  • Published : 1995.10.01

Abstract

The objective of this study is to investigate the effect of concrete strength on the stirrup effectiveness factor(K) of reinforced concrete beams with stirrup based on previous test results(a/d$\geq$2.5). In the procedure of the estimation of K, it was assumed that the ultimate shear strength for beams without stirrup is equal to the concrete contribution to shear strength for beam with stirrup. A model equation for calculation the stirrup of compressive strength of concrete. It was shown that the stirrup effective factor of compressive strength of concrete. It wah shown that the stirrup effective factor is greater than 1.0 up to compressive strength 85MPa. Therefore the current ACI Code equation for predicting the shear strength and the stirrup effectiveness factor of 1.0 is conservative for nomal and high stength concrete beams with stirrup.

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