Abstract This paper is concerned with the finite element (FE) modeling of mechanical behavior for concrete columns wrapped with fiber reinforced polymer (FRP) materials under uniform compression load. The introduced model is based on modifying damage evolution in concrete and FRP considered as a brittle material. In this work, the Miehe phase-field approach is employed for capturing the damage in the FRP, whereas the damage in concrete is evaluated by introducing an extension of the simplified damage formulation based on the Miehe phase-field model. One of the most advantages of the proposed model is that the ultimate condition is automatically imposed in the FE model, and there is no longer required any additional ad hoc criteria that consider in the previous models to evaluate the ultimate conditions. As the brittle material behavior, the simulation results show that the damage of the specimen under compression load at the final steps is rapidly developed and is significant. Moreover, the force–displacement curves are in good agreement with the experimental tests.

中文翻译：

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基于损伤塑性和相场法的 FRP 约束混凝土模型

摘要 本文涉及在均匀压缩载荷下用纤维增强聚合物 (FRP) 材料包裹的混凝土柱的力学行为的有限元 (FE) 建模。引入的模型基于修改混凝土和 FRP 中的损伤演化被视为脆性材料。在这项工作中，Miehe 相场方法用于捕获 FRP 中的损伤，而混凝土中的损伤是通过引入基于 Miehe 相场模型的简化损伤公式的扩展来评估的。所提出模型的最大优点之一是在有限元模型中自动强加了最终条件，并且不再需要在先前模型中考虑任何额外的临时标准来评估最终条件。作为脆性材料行为，模拟结果表明，试样在最后阶段的压缩载荷作用下的损伤迅速发展并且是显着的。此外，力-位移曲线与实验测试非常吻合。