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Title |
An Experimental Study on the Flexural Ductility of Doubly Reinforced Concrete Beams with Different Concrete Strength
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Keywords |
normal; high and ultra-high strength concrete; maximum strength; ultimate strain; displacement and curvature ductility factor |
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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 (p-p') was made not to be more than 0.75pb 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/㎠, the displacement and curvature ductility factore are increased by about 31-231 percents. And also increased in case of increased from 650 to 900kg/㎠, but the increasing ratio is gradually decreasing accoding to a concrete strength increases. And also found that as the Double Re-bar Ratio ((p-p')/pb) increases, so the displacement and curvature ductility ratio would decrease, but in case of increased from 650 to / 900kg㎠the decreasing ration is bigger than in case of increased from 240 to 650kg/㎠.
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