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Theoretical Research on Ultimate Bearing Capacity of Pier Strengthened Using Carbon Fiber Reinforced Polymer

机译:碳纤维增强聚合物加固墩墩极限承载力的理论研究

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摘要

Eccentric compression is one of the major reasons that cause the damage on piers of bridge construction. Making use of the prestressed carbon fiber reinforced polymer (CFRP) to strengthen bridge pier by winding it at a radial direction can give full play to the high strength and high performance of CFRP. As a result, the radial strain of concrete has been greatly constrained and the ultimate bearing capacity of bridge pier has been improved to a large extent. In this paper, the stress state of short column which is strengthened by prestressed CFRP has been analyzed theoretically under the situation of eccentric compression. According to the elastic-plastic theory, the calculation formulas of ultimate bearing capacity of short column strengthened by CFRP have been deduced under eccentric compression. The short column has a circular cross section and is made of reinforced concrete. The failure phenomena and failure mechanism of short column have been minutely analyzed, and the application of the calculation formulas has also been discussed in detail. Further more, consistency has been acquired after comparing this analytical solution with the numerical solution of finite element method (FEM). Therefore, these calculation formulas are not only reasonable and reliable but also have some application value for practical engineering.
机译:偏心压缩是造成桥梁施工墩柱损坏的主要原因之一。利用预应力碳纤维增强聚合物(CFRP)通过径向缠绕来加固桥墩,可以充分发挥CFRP的高强度和高性能。结果,极大地限制了混凝土的径向应变,并在很大程度上提高了桥墩的极限承载力。从理论上分析了在偏心受压情况下,预应力CFRP加固短柱的受力状态。根据弹塑性理论,推导了CFRP加固短柱的极限承载力的计算公式。短柱的横截面为圆形,由钢筋混凝土制成。详细分析了短柱的失效现象和失效机理,并详细讨论了计算公式的应用。此外,将这种解析解与有限元方法(FEM)的数值解进行比较后,已经获得了一致性。因此,这些计算公式不仅合理可靠,而且对实际工程具有一定的应用价值。

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