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首页> 外文期刊>Construction and Building Materials >Modelling GFRP-to-concrete joints with interface finite elements with rupture based on the Mohr-Coulomb criterion
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Modelling GFRP-to-concrete joints with interface finite elements with rupture based on the Mohr-Coulomb criterion

机译：基于Mohr-Coulomb准则的带有界面有限元的GFRP到混凝土节点的破裂模型

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The strengthening of reinforced concrete structures by means of externally bonded fibre reinforced polymers (FRPs) is now routinely considered and applied in the retrofit or strengthening of structures. FRP composites have received a considerable attention from civil engineers in recent years due to the high strength-weight and stiffness/weight ratios when compared to other materials. However, when FRP composites are bonded to a concrete surface, there is a persistent potential problem that the FRP plates may debond prematurely from the concrete. This is a very important issue for the engineers who have to focus on the computational modelling of this phenomenon. Some studies can be found in literature on computational modelling. However, there is very little information about the best modelling of the interface between FRP composites and concrete and this work is intended to help bridge this gap. The computational analysis presented here is based on three-dimensional software which assumes the smeared crack model, and the interface finite elements (FEs) used have a rupture criteria based on the Mohr-Coulomb criterion with tension cut-off. The definition of these FEs was based on double shear tests that were performed specifically for this purpose and they have shown that the debonding phenomenon can be predicted with some accuracy. In total, 10 double shear models were studied and the results were compared with the 21 experimental tests performed. The double shear tests consisted of applying loads to 2 layered CFRP laminates bonded to a 150 mm concrete cube with a bonded area of 150 × 80 mm (length × width). Double shear models with and without a gap interface were considered in order to emphasize the importance of modelling the GFRP-to-concrete interface with interface finite elements. The effect of the concrete strength on the interface performance was also considered. An externally bonded reinforcement (EBR) concrete T-beam strengthened with 2 CFRP layers is presented to illustrate the application of the method. The wet lay-up technique was used for the external reinforcement of a reinforced concrete T-beam and then tested under a four point bending test until rupture. The results are reported and differences between the numerical and the experimental results are discussed.
机译：现在通常考虑通过外部粘结的纤维增强聚合物（FRP）来增强钢筋混凝土结构，并将其应用于结构的翻新或加固。由于与其他材料相比，FRP复合材料具有很高的强度，重量和刚度/重量比，因此近年来受到了土木工程师的极大关注。但是，当将FRP复合材料粘结到混凝土表面时，存在一个潜在的潜在问题，即FRP板可能会过早地从混凝土上脱粘。对于必须专注于这种现象的计算建模的工程师来说，这是一个非常重要的问题。在有关计算建模的文献中可以找到一些研究。但是，关于FRP复合材料与混凝土之间的最佳界面建模的信息很少，这项工作旨在帮助弥补这一差距。此处提供的计算分析基于假定了裂纹涂污模型的三维软件，并且所使用的界面有限元（FE）具有基于带有拉力截止值的Mohr-Coulomb准则的破裂准则。这些有限元的定义是基于为此目的而专门进行的双剪切测试，它们表明脱胶现象可以准确预测。总共研究了10个双剪切模型，并将结果与​​进行的21个实验测试进行了比较。双重剪切测试包括将载荷施加到两层CFRP层压板上，该层压板粘结到150 mm混凝土立方体上，粘结面积为150×80 mm（长×宽）。为了强调用界面有限元对GFRP到混凝土界面进行建模的重要性，考虑了具有和不具有间隙界面的双剪切模型。还考虑了混凝土强度对界面性能的影响。提出了用2个CFRP层加固的外部粘结钢筋（EBR）混凝土T型梁，以说明该方法的应用。湿铺技术用于钢筋混凝土T型梁的外部加固，然后在四点弯曲试验下进行测试直至破裂。报告结果，并讨论数值和实验结果之间的差异。

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