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Title |
Torsional Strength of Reinforced Concrete Beams Subjected to Combined Loads
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DOI |
https://doi.org/10.4334/JKCI.2023.35.6.611 |
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Keywords |
비틀림; 철근콘크리트; 조합하중; 설계기준; 잠재강도 torsion; reinforced concrete; combined loads; design code; potential capacity |
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Abstract |
This work presents a torsional strength model based on the thin-walled tube theory and truss model, designed to assess the torsional strength of reinforced concrete beams subjected to combined loads. The proposed model considers the influence of longitudinal strains from each load, so that the effects of bending moment and shear force can be properly incorporated. Potential capacity criteria were introduced to evaluate torsional strength, taking into account the resistance mechanism and stress state induced by combined loads. The accuracy of the proposed model was validated using reinforced concrete beams subjected to combined loads, sourced from existing literature. Additionally, torsion design models outlined in structural design codes such as ACI 318, CSA A23.3, and Eurocode 2 were examined to comparatively assess torsional strength. The design code-specified torsion models evaluated reinforced concrete beams under the combined loads on the side of safety, with strength determined by reinforcement yielding, inadequately estimating asymmetrically reinforced beams in the longitudinal direction. The proposed model demonstrated the highest accuracy in estimating torsional strength, providing rational failure mode predictions.
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