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首页> 外文期刊>Composite Structures >The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM
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The effect of CFRP and CFRP/concrete interface models when modelling retrofitted RC beams with FEM

机译：CFRP和CFRP /混凝土界面模型在用有限元建模改造后的RC梁时的效果

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摘要

Concrete structures retrofitted with fibre reinforced plastic (FRP) applications have become widespread in the last decade due to the economic benefit from it. This paper presents a finite element analysis which is validated against laboratory tests of eight beams. All beams had the same rectangular cross-section geometry and were loaded under four point bending, but differed in the length of the carbon fibre reinforced plastic (CFRP) plate. The commercial numerical analysis tool Abaqus was used, and different material models were evaluated with respect to their ability to describe the behaviour of the beams. Linear elastic isotropic and orthotropic models were used for the CFRP and a perfect bond model and a cohesive bond model was used for the concrete-CFRP interface. A plastic damage model was used for the concrete. The analyses results show good agreement with the experimental data regarding load-displacement response, crack pattern and debonding failure mode when the cohesive bond model is used. The perfect bond model failed to capture the softening behaviour of the beams. There is no significant difference between the elastic isotropic and orthotropic models for the CFRP.
机译：在过去的十年中，由于纤维增强塑料（FRP）带来的经济利益，这种结构已得到广泛应用。本文提出了一种有限元分析方法，该方法可以通过八根梁的实验室测试得到验证。所有梁具有相同的矩形横截面几何形状，并在四点弯曲下承受载荷，但碳纤维增强塑料（CFRP）板的长度不同。使用了商业数值分析工具Abaqus，并就其描述光束行为的能力评估了不同的材料模型。 CFRP使用线性弹性各向同性和正交异性模型，混凝土-CFRP界面使用完美粘结模型和内聚粘结模型。对混凝土使用了塑性损伤模型。分析结果表明，当采用内聚力模型时，在载荷-位移响应，裂纹模式和剥离破坏模式方面与实验数据吻合良好。完美的粘结模型无法捕获梁的软化行为。 CFRP的弹性各向同性模型和正交各向异性模型之间没有显着差异。

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