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Deflection behavior of a prestressed concrete beam reinforced with carbon fibers at elevated temperatures

机译:碳纤维增强的预应力混凝土梁在高温下的挠度特性

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摘要

Fiber reinforced polymer(FRP) have unique advantages like high strength to weight ratio, excellent corrosion resistance, improving deformability and cost effectiveness. These advantages have gained wide acceptance in civil engineering applications. FRP tendons for prestressing applications are emerging as one of the most promising technologies in the civil engineering industry. However, the behavior of such members under the influence of elevated temperatures is still unknown. The knowledge and application of this could lead to a cost effective and practical considerations in fire safety design. Therefore, this study examines the deflection behavior of the carbon fiber reinforced polymer(CFRP) prestressed concrete beam at elevated temperatures. In this article, an analytical model is developed which integrates the temperature dependent changes of effective modulus of FRP in predicting the deflection behavior of CFRP prestressed concrete beams within the range of practical temperatures. This model is compared with a finite element mode (FEM) of a simply supported concrete beam prestressed with CFRP subjected to practical elevated temperatures. In addition, comparison is also made with an indirect reference to the real behavior of the material. The results of the model correlated reasonably with the finite element model and the real behavior. Finally, a practical application is provided.
机译:纤维增强聚合物(FRP)具有独特的优势,例如高强度/重量比,优异的耐腐蚀性,改善的可变形性和成本效益。这些优势已在土木工程应用中得到广泛认可。用于预应力应用的FRP筋正在成为土木工程行业中最有前途的技术之一。但是,这种构件在高温影响下的行为仍然未知。对此的了解和应用可能会导致在消防安全设计中具有成本效益和实用性的考虑。因此,本研究探讨了碳纤维增强聚合物(CFRP)预应力混凝土梁在高温下的挠度行为。在本文中,建立了一个分析模型,该模型综合了温度相关的FRP有效模量变化,以预测CFRP预应力混凝土梁在实际温度范围内的挠曲行为。将该模型与经过CFRP预应力的简单支撑混凝土梁的有限元模式(FEM)进行了实际的高温比较。此外,还通过间接引用材料的实际行为进行比较。该模型的结果与有限元模型和实际行为合理地相关。最后,提供了实际应用。

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