Enfedaque Alejandro, Suárez Fernando, Alberti Marcos G, Gálvez Jaime C
Departamento de Ingeniería Civil-Construcción, Universidad Politécnica de Madrid, E.T.S.I. Caminos, Canales y Puertos, 28040 Madrid, Spain.
Departamento de Ingeniería Mecánica y Minera, Universidad de Jaén, 23071 Jaén, Spain.
Materials (Basel). 2022 Mar 21;15(6):2323. doi: 10.3390/ma15062323.
The use of fibres as structural reinforcement in concrete is included in standards, providing guidelines to reproduce their behaviour, which have been proven adequate when steel fibres are used. Nevertheless, in recent years new materials, such as polyolefin fibres, have undergone significant development as concrete reinforcement. This work gives insight on how suitable the constitutive models proposed by the Model Code 2010 (MC2010) are in the case of such polymer fibres. A set of numerical models has been carried out to reproduce the material behaviour proposed by the MC2010 and the approach based on the softening function proposed by the authors. The results show remarkable differences between the experimental results and the numerical simulations when the constitutive models described in the MC2010 are employed for different polyolefin fibre reinforced concrete mixes, while the material behaviour can be reproduced with greater accuracy if the softening function proposed by the authors is employed when this type of macro-polymer fibres is used. Moreover, the relatively complex behaviour of polyolefin fibre reinforced concrete may be reproduced by using such constitutive model.
在混凝土中使用纤维作为结构增强材料已被纳入标准，这些标准提供了再现其性能的指导方针，在使用钢纤维时已证明这些指导方针是足够的。然而，近年来，诸如聚烯烃纤维等新材料作为混凝土增强材料有了显著发展。这项工作深入探讨了《2010 年模型规范》（MC2010）提出的本构模型在这种聚合物纤维情况下的适用性。已经进行了一组数值模型来再现 MC2010 提出的材料性能以及作者基于软化函数提出的方法。结果表明，当将 MC2010 中描述的本构模型用于不同的聚烯烃纤维增强混凝土混合料时，实验结果与数值模拟之间存在显著差异，而当使用这种类型的宏观聚合物纤维时，如果采用作者提出的软化函数，则可以更准确地再现材料性能。此外，使用这种本构模型可以再现聚烯烃纤维增强混凝土相对复杂的性能。
