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Structural Engineering and Mechanics Volume 92, Number 4, November25 2024 , pages 393-404 DOI: https://doi.org/10.12989/sem.2024.92.4.393 |
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Prediction for the shear capacity of unbonded PRC beam with high strength spiral stirrups |
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Hao Zhang, Wei Huang, Bolong Liu and Qingning Li
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| Abstract | ||
| To investigate the mechanical behavior of unbonded prestressed reinforced concrete (PRC) beam with high-strength spiral stirrups, the shear capacity formula of the beam was proposed in this study based on modified variable angle truss and arch models. Considering the effect of the spiral stirrups and unbonded tendons, the theoretical formula of the shear capacity of the beam was derived. Furthermore, the coefficients related to the formula, such as the equivalent angle and stress of spiral stirrups, the ratio of shear span to effective depth, and the concrete compression zone depth of the arch model were determined. The complicated theoretical formula was further simplified for ease of use by engineers. In addition, the finite element model of the PRC beam was established and verified by test data. The additional FE model of PRC beam with spiral stirrups was established and parametric analysis was carried out. Finally, the proposed formula was validated by numerical results of the beam with spiral stirrups. The calculated values of the formula are in good agreement with the numerical simulation data. This study may enrich the understanding of the shear capacity of the unbonded PRC beam with high-strength spiral stirrups. | ||
| Key Words | ||
| finite element model; high strength spiral stirrups; PRC beam; shear capacity; truss and arch model; unbonded tendons | ||
| Address | ||
| Hao Zhang, Wei Huang: School of Civil Engineering, Xi | ||