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Wound FRP (W-FRP) is a novel reinforcing system for concrete structures with complex geometries, which is fabricated by winding wet fibers impregnated with epoxy around the flexural reinforcements. Compared to the traditional FRP shear reinforcement, W-FRP could have optimized layouts with closed-shape geometry, showing great potential in digital fabrication. However, the failure mechanisms of W-FRP and its impacts on the shear failure of W-FRP reinforced concrete beams are not fully revealed by the literature, despite the numerous experimental studies. In this work, a new numerical modelling approach considering the material anisotropy of the unidirectional FRP reinforcement is proposed to accurately simulate the failure of W-FRP reinforcement under complex stress states at the bent corners and the shear failure of W-FRP reinforced concrete beams. Validated against physical testing, the modelling approach shows great validity. The failure mechanisms of singular W-FRP link at the bent corners and W-FRP reinforced concrete beams are analyzed. Further parametric analysis is conducted to investigate the impacts of cross-section parameters on the failure of singular W-FRP link and the layout parameters on the shear failure of W-FRP reinforced concrete. This work shows that the failure of the bent corners of W-FRP is initiated by the fiber tension damage accumulation on the bent corner cross-section, which starts from the elements of the bent corners from the inner perimeter. The material anisotropy has significant impacts on the stress distribution along the cross-section in the elastic range and hence the failure. Whilst, the layouts of the W-FRP reinforcement influence the shear capacity of concrete beams through impacting the crack propagation and the resulting stresses developed in the W-FRP reinforcement. By varying the angle of the W-FRP, the shear capacity develops in a ‘S’ shape pattern, with the model with 75-degree W-FRP reaching the maximum load. With increasing cross-section area and spacing, the shear capacity mainly drops, which could be attributed to the changes in material property and cracking pattern.

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Failure Mechanism of Wound FRP Reinforcement and Impacts of Reinforcement Layout on Shear Capacity of Concrete Beams

  • 会议论文

  • 发表日期：

    2025年

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  • Yuanzhang Yang,
  • Weijian Zhao

摘要

Wound FRP (W-FRP) is a novel reinforcing system for concrete structures with complex geometries, which is fabricated by winding wet fibers impregnated with epoxy around the flexural reinforcements. Compared to the traditional FRP shear reinforcement, W-FRP could have optimized layouts with closed-shape geometry, showing great potential in digital fabrication. However, the failure mechanisms of W-FRP and its impacts on the shear failure of W-FRP reinforced concrete beams are not fully revealed by the literature, despite the numerous experimental studies. In this work, a new numerical modelling approach considering the material anisotropy of the unidirectional FRP reinforcement is proposed to accurately simulate the failure of W-FRP reinforcement under complex stress states at the bent corners and the shear failure of W-FRP reinforced concrete beams. Validated against physical testing, the modelling approach shows great validity. The failure mechanisms of singular W-FRP link at the bent corners and W-FRP reinforced concrete beams are analyzed. Further parametric analysis is conducted to investigate the impacts of cross-section parameters on the failure of singular W-FRP link and the layout parameters on the shear failure of W-FRP reinforced concrete. This work shows that the failure of the bent corners of W-FRP is initiated by the fiber tension damage accumulation on the bent corner cross-section, which starts from the elements of the bent corners from the inner perimeter. The material anisotropy has significant impacts on the stress distribution along the cross-section in the elastic range and hence the failure. Whilst, the layouts of the W-FRP reinforcement influence the shear capacity of concrete beams through impacting the crack propagation and the resulting stresses developed in the W-FRP reinforcement. By varying the angle of the W-FRP, the shear capacity develops in a ‘S’ shape pattern, with the model with 75-degree W-FRP reaching the maximum load. With increasing cross-section area and spacing, the shear capacity mainly drops, which could be attributed to the changes in material property and cracking pattern.