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首页> 外文期刊>Cement and Concrete Research >A discrete-continuum coupled finite element modelling approach for fibre reinforced concrete
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A discrete-continuum coupled finite element modelling approach for fibre reinforced concrete

机译：一种离散的纤维增强混凝土耦合有限元建模方法

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摘要

Fibre reinforced concrete (FRC) exhibits complicated failure modes such as fibre breakage, mortar cracking, crushing and spalling, fibre-mortar interfacial debonding, depending on many material properties, geometric dimensions, boundary and loading conditions. Most existing numerical models are unable to reproduce these failure modes that may occur simultaneously or sequentially in a specimen, mainly due to difficulties in generating finite element meshes with a large number of randomly-oriented fibres. Herein we develop a discrete continuum coupled finite element modelling approach for FRC materials capable of effectively simulating all the major failure modes. The continuum damaged plasticity model is used to simulate damage and fracture behaviour of the mortar, while debonding of fibre-mortar interfaces is modelled by nonlinear cohesive interfacial elements. Unique techniques are devised to generate conforming meshes between fibres and the surrounding mortar so that the randomly-oriented fibres are easily modelled. The modelling approach is validated by simulating single fibre pullout tests with different inclination angles, notched and non-notched direct tensile tests and three-point bending beam tests with randomly-distributed multiple fibres.
机译：纤维钢筋混凝土（FRC）表现出复杂的故障模式，如纤维破裂，砂浆开裂，破碎和剥落，纤维砂浆界面剥离，取决于许多材料特性，几何尺寸，边界和装载条件。大多数现有数值模型不能再现可能在样本中同时或顺序发生的这些故障模式，主要是由于产生具有大量随机导向纤维的有限元啮合物的困难。在此，我们开发了一种离散的连续耦合有限元建模方法，用于有效地模拟所有主要故障模式的FRC材料。连续损坏的可塑性模型用于模拟砂浆的损伤和断裂行为，而纤维砂浆界面的剥离是由非线性粘性界面元素建模的。设计了独特的技术，以在纤维和周围砂浆之间产生符合网格，使得随机取向的纤维很容易建模。通过模拟具有不同倾斜角的单光纤拉出测试，缺口和非缺乏直接拉伸试验和三点弯曲梁测试，验证了建模方法，以及具有随机分布的多纤维的三点弯曲梁测试。

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