An Experimental Study on the Flexural Ductility of Doubly Reinforced Concrete Beams with Different Concrete Strength

Title & Authors
An Experimental Study on the Flexural Ductility of Doubly Reinforced Concrete Beams with Different Concrete Strength
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Abstract
This paper presents a study on the flexural ductility of reinforced concrete beams, 16beams with different concrete strength, reinforcement ratio, reinfo- rcement strength. For the purpose of inducing flexural failure, the reinforce ratio ($\small{\rho}$-$\small{\rho}$') was made not to be more than $\small{0.75\rho}$b in accordance with ACi code 318-89. From the test results, it is found that in case of a concrete strength increased from 240 to 650kg/$\small{\textrm{cm}^2}$, the displacement and curvature ductility factore are increased by about 31-231 percents. And also increased in case of increased from 650 to 900kg/$\small{\textrm{cm}^2}$, but the increasing ratio is gradually decreasing accoding to a concrete strength increases. And also found that as the Double Re-bar Ratio (($\small{\rho}$-$\small{\rho}$')/$\small{\rho}$b) increases, so the displacement and curvature ductility ratio would decrease, but in case of increased from 650 to /$\small{900kg\textrm{cm}^2}$ the decreasing ration is bigger than in case of increased from 240 to $\small{650kg/\textrm{cm}^2}$.
Keywords
normal;high and ultra-high strength concrete;maximum strength;ultimate strain;displacement and curvature ductility factor;
Language
Korean
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References
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