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<p>Polyurea–concrete composite structures are widely used in hydraulic engineering, but their mechanical mechanism, especially the influence of nonlinear damage of concrete on the interface response, is still unclear. In this study, a coupled analysis framework was developed by integrating pullout tests with finite element simulations, incorporating polyurea hyperelasticity, a cohesive zone model (CZM) for the interface, and a concrete damage plasticity (CDP) model. A sensitivity analysis of the CDP model parameters reveals that the dilation angle <i>ψ</i>, yield shape parameter <i>K</i><sub><i>c</i></sub>, and yield stress value <i>f</i><sub><i>b</i>0</sub>/<i>f</i><sub><i>c</i>0</sub> are the dominant factors affecting interfacial stress, while the viscosity parameter <i>v</i> has a relatively minor influence. Based on experimental failure data, model calibration was conducted, yielding reasonable parameter values of <i>ψ</i> = 31°, <i>K</i><sub><i>c</i></sub> = 0.67, <i>f</i><sub><i>b</i>0</sub>/<i>f</i><sub><i>c</i>0</sub> = 1.18, and <i>v</i> = 0.0005. The validated model was then applied to an expansion joint system in a water conveyance tunnel, establishing an analysis method for evaluating interfacial damage and durability, which provides theoretical support for future engineering design and assessment.</p>

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Study on the Nonlinear Damage Characteristics and Applications of Polyurea–Concrete Composite Structures

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Bingqi Li,
  • Jiangchao Liu,
  • Xiaonan Liu,
  • Tianyi Meng

摘要

Polyurea–concrete composite structures are widely used in hydraulic engineering, but their mechanical mechanism, especially the influence of nonlinear damage of concrete on the interface response, is still unclear. In this study, a coupled analysis framework was developed by integrating pullout tests with finite element simulations, incorporating polyurea hyperelasticity, a cohesive zone model (CZM) for the interface, and a concrete damage plasticity (CDP) model. A sensitivity analysis of the CDP model parameters reveals that the dilation angle ψ, yield shape parameter Kc, and yield stress value fb0/fc0 are the dominant factors affecting interfacial stress, while the viscosity parameter v has a relatively minor influence. Based on experimental failure data, model calibration was conducted, yielding reasonable parameter values of ψ = 31°, Kc = 0.67, fb0/fc0 = 1.18, and v = 0.0005. The validated model was then applied to an expansion joint system in a water conveyance tunnel, establishing an analysis method for evaluating interfacial damage and durability, which provides theoretical support for future engineering design and assessment.