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Structural Engineering and Mechanics Volume 33, Number 2, September30 2009 , pages 137-158 DOI: https://doi.org/10.12989/sem.2009.33.2.137 |
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Effect of spiral reinforcement on flexural-shear-torsional seismic behavior of reinforced concrete circular bridge columns |
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Abdeldjelil Belarbi, Suriya Prakash and Young-Min You
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| Abstract | ||
| This paper investigates the behavior of reinforced concrete (RC) circular columns under combined loading including torsion. The main variables considered in this study are the ratio of torsional moment to bending moment (T/M) and the level of detailing for moderate and high seismicity (low and high transverse reinforcement/spiral ratio). This paper presents the results of tests on seven columns subjected to cyclic bending and shear, cyclic torsion, and various levels of combined cyclic bending, shear, and torsion. Columns under combined loading were tested at T/M ratios of 0.2 and 0.4. These columns were reinforced with two spiral reinforcement ratios of 0.73% and 1.32%. Similarly, the columns subjected to pure torsion were tested with two spiral reinforcement ratios of 0.73% and 1.32%. This study examined the significance of proper detailing, and spiral reinforcement ratio and its effect on the torsional resistance under combined loading. The test results demonstrate that both the flexural and torsional capacities are decreased due to the effect of combined loading. Furthermore, they show a significant change in the failure mode and deformation characteristics depending on the spiral reinforcement ratio. The increase in spiral reinforcement ratio also led to significant improvement in strength and ductility. | ||
| Key Words | ||
| circular columns; combined loadings; confinement; ductility; flexure; interaction diagrams; shear; spiral reinforcement ratio; torsion. | ||
| Address | ||
| Abdeldjelil Belarbi, Suriya Prakash and Young-Min You: Dept. of Civil,Environmental and Archictectural Engineering, Missouri University of Science and Technology, Rolla, Missouri, USA | ||