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Title |
Maximum Torsional Strength of Reinforced Concrete Beams (II) Correlation with Maximum Shear Strength
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Authors |
이정윤(Jung-Yoon Lee) ; 김길희(Kil-Hee Kim) ; 신동익(DongIk Shin) |
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DOI |
https://doi.org/10.4334/JKCI.2021.33.6.589 |
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Keywords |
최대 비틀림강도; 비틀림강도 감소 계수; 비틀림파괴모드; 트러스모델; 최대 전단강도 maximum torsional strength; torsional strength reduction factor; torsional failure modes; truss model; maximum shear strength |
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Abstract |
The shear design and torsion design of reinforced concrete members are interrelated. The maximum yield strength of shear and torsional reinforcement in the KCI-21 code are the same at 500 MPa. Members subjected to both shear and torsion are designed taking into account the effects of both forces. In the KCI-21 design code, the provisions for maximum shear strength have been modified, but there are no modifications for maximum torsional strength. As a result, the provisions of the KCI-21 code for the maximum shear strength are contradictory. In this paper, the maximum torsional strength derived from the space truss model was evaluated. The maximum torsional strength derived from the space truss model over-estimated the strengths of 143 RC beams. For the flexural compression region and three-dimensional node region, and because of the effect of warping on the maximum torsional strength, the maximum torsional strength reduction factor of 0.5 should be applied. In addition, to apply the maximum yield strength of shear reinforcement of 500 MPa to the torsional reinforcement, the maximum torsional strength reduction factor of 0.5 should be applied.
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