弯曲纤维增强聚合物(FRP)钢筋 减少混凝土中的钢筋退化程度
摘要
蚀性环境的结构的可行替代方案,并且在需要卓越耐腐蚀性能的许多可能应用中。然而,使用 FRP钢筋作为混凝土
的内部钢筋,仅限于特定的结构元素,尚未扩展到整个结构。其原因与市场上弯曲或成型增强 FRP元件的有限可用
性以及它们降低的结构性能有关。本文介绍了对弯曲 FRP复合材料强度退化的最新综述,并评估了现有 FRP增强材
料弯曲能力预测模型的性能。先前的研究表明,在多轴应力组合下,FRP钢筋弯曲部分的机械性能显着降低。事实
上,弯曲 FRP钢筋的抗拉强度可低至直条的最大抗拉强度的 25%。在很多情况下,发现目前对 FRP加固混凝土结构
的设计建议高估了 FRP钢筋的抗弯能力。这篇评论文章讨论了基于Tsai-Hill失效准则的更准确和实用的预测模型,
并且探索了在土木工程应用中使用弯曲 /成型 FRP复合材料的潜在挑战和未来研究方向。
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[1]Garcia, R.; Jemaa, Y.; Helal, Y.; Guadagnini, M.;
Pilakoutas, K. Seismic strengthening of severely damaged
beam-column RC joints using CFRP. J. Compos. Constr. 2014,
18, 1–10.
[2]Garcia, R.; Hajirasouliha, I.; Pilakoutas, K. Seismic
behaviour of deficient RC frames strengthened with CFRP
composites. Eng. Struct. 2010, 32, 3075–3085.
[3]Yang, X.; Wei, J.; Nanni, A.; Dharani, L.R. Shape
Effect on the Performance of Carbon Fiber Reinforced Polymer
Wraps. J. Compos. Constr. ASCE 2004, 8, 444–451.
[4]Robert, M.; Benmokrane, B. Effect of aging on bond of
GFRP bars embedded in concrete. Cem. Concr. Compos. 2010,
32, 461–467.
[5]Williams, B.; Kodur., V.; Green, M.; Bisby., L. Fire
endurance of fiber-reinforced polymer strengthened concrete
T-beams. J. ACI Struct. 2008, 105, 60–67.
[6]Alsayed, S.H. Flexural behaviour of concrete beams
reinforced with GFRP bars. Cem. Concr. Compos. 1998, 20,
1–11.
[7]Katz, A.; Berman, N. Modeling the effect of high
temperature on the bond of FRP reinforcing bars to concrete.
Cem. Concr. Compos. 2000, 22, 433–443.
[8]Saafi, M. Effect of fire on FRP reinforced concrete
members. Compos. Struct 2002, 58, 11–20.
[9]Bisby, L.A. Fire Behavior of Fiber-Reinforced Polymer
Reinforced or Confined Concrete. Ph.D. Thesis, Queen’s
University, Kingston, ON, Canada, 2003.
[10]Adimi, R.; Rahman, H.; Benmokrane, B.; Kobayashi,
K. Effect of temperature and loading frequency on the fatigue
life of a CFRP bar in concrete. In Proceedings of the second
international conference on composites in infrastructure (ICCI-
98), Tucson, Arizona, 5–7 January 1998; pp. 203–210.
[11]Hawileh, R.A.; Naser, M.Z. Thermal-stress analysis
of RC beams reinforced with GFRP bars. Compos. Part B Eng.
2012, 43, 2135–2142.
[12]Hawileh, R.; Naser, M.; Rasheed, H. Thermal-stress
finite element analysis of CFRP strengthened concrete beam
exposed to top surface fire. Mech. Adv. Mater. Struct. 2011,
18, 172–180.
DOI: http://dx.doi.org/10.12361/2661-3565-03-08-53
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