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논문 기본 정보

자료유형
학술저널
저자정보
Jianchao Xu (Beihang University) Shenggang Chen (Beihang University) Quanquan Guo (Beihang University) Yinghua Ye (Beihang University) Bo Diao (Beihang University) Y. L. Mo (University of Houston)
저널정보
한국콘크리트학회 International Journal of Concrete Structures and Materials International Journal of Concrete Structures and Materials Vol.12 No.3
발행연도
2018.3
수록면
397 - 413 (17page)

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초록· 키워드

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U-shaped thin-walled concrete bridge beams usually suffer the combined actions of flexure, shear and torsion, but no research about the behavior of U-shaped thin-walled RC beams under combined actions has been reported in literature. Three large specimens of U-shaped thin-walled RC beams were tested under different torque–bending moment ratios (T–M ratios) of 1:5, 1:1 and 1:0 to investigate the mechanical responses such as crack patterns, reinforcement strains, failure modes and ductility. The testing results showed that ductile flexural failures occurred for all three of the U-shaped thin-walled beam specimens, although the combined shear effect of circulatory torque, warping torque and shear force increased as the T–M ratio increased from 1:5 via 1:1 to 1:0, reflected by diagonal cracks and stirrup strains. More specifically, basically symmetrical flexural failure was dominated by the bending moment when the T–M ratio was 1:5; flexural failure of the loaded half of the U-shaped thin-walled section was dominated by the combined action of the bending moment and warping moment, while there were only a few cracks on the other half of the U-shaped section when the T–M ratio was 1:1; and anti-symmetrical flexural failure was dominated by the warping moment when the T–M ratio was 1:0 (pure torsion). A simple method to calculate the ultimate load of such U-shaped thin-walled RC beams under different T–M ratios was suggested, and the calculating results were corresponding well with the experimental results.
#reinforced concrete #U-shaped thin-walled beam #combined action of torsion and flexure #warping torsion #ultimate load

목차

Abstract
1. Introduction
2. Experimental Plan
3. Test Results and Discussion
4. Method to Calculate the First Cracking Load and the Ultimate Load
5. Conclusions
References

참고문헌 (39)

참고문헌 신청
ACI 318-14. (2014). Building code requirements for structural concrete (ACI 318-14). Farmington Hills, MI: American Concrete Institute. Aminbaghai, M., Murin, J., Hrabovsky, J., & Mang, H. A. (2016). Torsional warping eigenmodes including the effect of the secondary torsion moment on the deformations. Engineering Structures, 106, 299?316. Bernardo, L., Andrade, J., & Lopes, S. (2012a). Modified variable angle truss-model for torsion in reinforced concrete beams. Materials and Structures, 45(12), 1877?1902. Bernardo, L., Andrade, J., & Lopes, S. (2012b). Softened truss model for reinforced NSC and HSC beams under torsion: A comparative study. Engineering Structures, 42, 278?296. Bernardo, L. F. A., Andrade, J. M. A., & Nunes, N. C. G. (2015). Generalized softened variable angle truss-model for reinforced concrete beams under torsion. Materials and Structures, 7, 2169?2193.

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