EFFECTS OF MATERIAL PROPERTIES ON FLEXURAL FAILURE PROCESS AND FLEXURAL TOUGHNESS OF REINFORCED CONCRETE BEAMS

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  • RCはりの曲げ破壊過程と曲げじん性に及ぼす材料特性の影響
  • RCハリ ノ マゲ ハカイ カテイ ト マゲ ジンセイ ニ オヨボス ザイリョ

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Abstract

The effects of material properties (concrete and steel), cross-sectional properties (reinforcement ratios and dimensions) and axial loads on the cross-sectional dissipating energy up to yield-ending point of RC beams are theoretically investigated. The dissipating energy of RC beams increases with an increase in both toughness (area under stress-strain curve) of concrete and compression reinforcement ratio. When pσsy (tension reinforcement ratio; yield strength of steel) is relativelly small, pσsy has little effects on the dissipating energy of RC beams. Equations for calculating upper and lower limits of tension reinforcement ratio for ductile failure of RC beams are presented by using toughness of concrete. Dissipating energy Wit, and plastic rotation capacity φρ (=Wit/Mu) are proposed as toughness parameters of RC beams.

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