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A comparative study of continuous beams prestressed with bonded FRP and steel tendons

机译：FRP与钢纤维预应力连续梁的比较研究。

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This paper presents a numerical investigation of the performance of continuous prestressed concrete beams with bonded fiber reinforced polymer (FRP) and steel tendons. A finite element model has been developed and is validated against the available test data. A numerical test is carried out on two-span continuous bonded prestressed concrete beams. Three types of tendons are considered for a comparative study: aramid FRP (AFRP), carbon FRP (CFRP) and prestressing steel. Various levels of omega(p) (reinforcement index of prestressing tendons) are used. The results indicate that, with increasing omega(p), the failure mode of FRP prestressed concrete beams would transit from tendon rupture to concrete crushing while the crushing failure always takes place in steel prestressed concrete beams. Moreover, FRP tendons mobilize significantly different behavior regarding the crack pattern, deformation characteristics and neutral axis depth compared to steel tendons. The moment redistribution at ultimate in AFRP prestressed concrete beams is comparable to that in steel prestressed concrete beams while, at a low omega(p) level, CFRP tendons register obviously lower redistribution than steel tendons. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文提供了对具有粘结纤维增强聚合物（FRP）和钢索的连续预应力混凝土梁性能的数值研究。已经开发了有限元模型，并针对可用的测试数据进行了验证。在两跨连续粘结的预应力混凝土梁上进行了数值测试。为了进行比较研究，考虑了三种类型的腱：芳纶FRP（AFRP），碳FRP（CFRP）和预应力钢。使用各种水平的ω（预应力筋的增强指数）。结果表明，随着omega（p）的增加，FRP预应力混凝土梁的破坏模式将从腱断裂转变为混凝土破碎，而破碎破坏总是发生在钢预应力混凝土梁中。此外，与钢筋相比，FRP筋在裂纹模式，变形特性和中性轴深度方面具有明显不同的行为。 AFRP预应力混凝土梁的极限弯矩重新分布与钢预应力混凝土梁的弯矩重新分布相当，而在低ω（p）水平下，CFRP筋的重新分布明显低于钢筋。 （C）2015 Elsevier Ltd.保留所有权利。

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