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Prediction of Shear Strength in High-Strength Concrete Beams without Web Reinforcement Considering Size Effect
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 Title & Authors
Prediction of Shear Strength in High-Strength Concrete Beams without Web Reinforcement Considering Size Effect
Bae, Young-Hoon; Yoon, Young-Soo;
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Recent research has indicated that the current ACI shear provision provides unconservative predictions for large slender beams and beams with low level of longitudinal reinforcement, and conservative results for deep beams. To modify some problems of ACI shear provision, ultimate shear strength equation considering size effect and arch action to compute shear strength in high-strength concrete beams without stirrups is presented in this research. Three basic equations, namely size reduction factor, rho factor, and arch action factor, are derived from crack band model of fracture mechanics, analysis of previous some shear equations for longitudinal reinforcement ratio, and concrete strut described as linear prism in strut-tie model deep beams. Constants of basic equations are determined using statistical analysis of previous shear testing data. To verify proposed shear equation for each variable, effective depth, longitudinal reinforcement ratio, concrete compressive strength and shear span-to-depth ratio, about 300 experimental data are used and proposed shear equation is compared with ACI 318-99 code, CEB-FIP Model code, Kim &Park's equation and Zsutty's equation. The proposed shear equation is not only simpler than other shear equations, it is but also shown to be economical predictions and reasonable safety margin. Hence proposed shear strength equation is expected to be applied to practical shear design.
shear strength equations;reinforced concrete beams;size effect;arch action;regression analysis;
 Cited by
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한국콘크리트학회논문집, 2006. vol.18. 5, pp.611-620 crossref(new window)
전단보강근이 없는 고강도 콘크리트 깊은 보의 전단특성 실험연구,양성환;이동준;

한국건축시공학회지, 2014. vol.14. 4, pp.336-342 crossref(new window)
Experimental Study of Reinforced High-Strength Concrete Beams without Stirrups Considering Shear Behaviour, Journal of the Korea Institute of Building Construction, 2014, 14, 4, 336  crossref(new windwow)
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