Energy Ductility of HSC Heavily Steel Reinforced Members under Bending

With the advent of advanced mineral and chemical admixtures, the strength level of concrete has been raised dramatically and high-strength concrete (HSC) is becoming more and more commonly used. However, HSC is generally more brittle than normal strength concrete. In the flexural design of reinforced concrete beams, apart from the provision of adequate strength, it is also necessary to provide a certain minimum level of ductility. In fact, it has been shown that the use of HSC, if not properly controlled, could significantly reduce the flexural ductility of reinforced concrete beams. A number of six heavily steel reinforced high strength concrete, HSC beams with different percentage of ρ and ρ′ were cast and incrementally loaded under bending. A test series with heavily reinforced concrete beams under fourpoint bending was performed to examine the ductility of structure. During the test, the strain on the concrete middle face and on the tension and compression bars and also the deflection at different points of the span length were measured up to failure. Based on the obtained results, the displacement and energy ductility of the HSC members are more deeply reviewed.

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Keywords Displacement and energy ductility ، Plastic rotation ، HSC