Structural Engineering and Mechanics

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Prediction for the shear capacity of unbonded PRC beam with high strength spiral stirrups

  • Hao Zhang (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Wei Huang (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Bolong Liu (School of Civil Engineering, Shaoxing University) ;
  • Qingning Li (School of Civil Engineering, Xi'an University of Architecture and Technology)
  • Received : 2023.09.08
  • Accepted : 2024.11.11
  • Published : 2024.11.25
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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.

Keywords

Acknowledgement

This work was supported by National Natural Science Foundation of China (52378193), National Natural Science Foundation Youth Program (52308203), Shaanxi Province and Technology Plan Project (S2023-JC-QN-0573), Shaanxi Province technology innovation guidance special project (2023GXLH-054), and Key R&D projects of Shaanxi Province-Key industry innovation project (2020ZDLNY06-04, 2021ZDLSF05-11).

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