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Deflection and cracking behavior of SFRSCC beams reinforced with hybrid prestressed GFRP and steel reinforcements

机译:GFRP和钢纤维混合加固SFRSCC梁的挠度和开裂性能。

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摘要

In the present work, the deflection and cracking behavior of I-shaped cross-sectional beams of Steel Fiber Reinforced Self-Compacting Concrete (SFRSCC) reinforced in flexure with hybrid prestressed steel strand and glass fiber reinforced polymer (GFRP) bars was investigated. Combining prestressed GFRP bars of relatively low elasticity modulus, but immune to corrosion (located with a small concrete cover), with prestressed steel strand (with higher concrete cover to avoid corrosion), a good balance in terms of reinforcement effectiveness, ductility, durability and cost competitiveness can be obtained. The steel strand aims also to assure the necessary flexural strengthening of the beams if GFRP bars become ineffective in case of fire occurrence. This work presents and discusses the results obtained from the experimental study of the beams tested in flexure under monotonic loading conditions. Additionally, the predictive performance of the available formulation in the design codes for the case of Fiber Reinforced Concrete (FRC) and FRP reinforced Concrete (FRP-RC) was assessed to be used for the proposed hybrid system.
机译:在本工作中,研究了混合预应力钢绞线和玻璃纤维增​​强聚合物(GFRP)钢筋在弯曲状态下加固的钢纤维自密实混凝土(SFRSCC)的I形截面梁的挠度和开裂行为。将弹性模量相对较低但抗腐蚀的预应力GFRP筋(具有较小的混凝土覆盖层)与预应力的钢绞线(具有较高的混凝土覆盖层以避免腐蚀)组合在一起,在增强效果,延展性,耐久性和可以获得成本竞争力。钢绞线的目的还在于,如果在发生火灾的情况下GFRP筋失效,则可以确保对梁进行必要的抗弯加固。这项工作提出并讨论了在单调加载条件下弯曲测试的梁的实验研究中获得的结果。此外,评估了设计规范中可用配方的纤维增强混凝土(FRC)和FRP增强混凝土(FRP-RC)的预测性能,以用于拟议的混合系统。

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