地质聚合物和环氧树脂加固CFRP钢筋混凝土梁性能试验研究

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
Baocheng Liu, Jinliang Liu, Yanqian Wen, Qinglin Hu, Liang Liu, Shilin Zhao
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引用次数: 1

摘要

目的为了获得地质聚合物粘结碳纤维增强聚合物(CFRP)加固梁的抗剪和抗弯性能,研究了浸渍胶类型、加固方案、CFRP层和预裂宽度的影响,并通过建立有限元模型(FEM)对CFRP加固梁的性能进行了验证。设计/方法/方法本文对环氧CFRP加固(ECS)和地质聚合物CFRP增强(GCS)进行了静载试验和有限元分析,并对其承载力和刚度进行了比较,结果表明,GCS型钢筋混凝土梁是可行和有效的。研究了不同预裂宽度的GCS RC梁的承载力、裂缝分布和发展、荷载-挠度曲线。地质聚合物的加固效果达到了与环氧树脂相同的效果,有效地提高了梁的极限承载力,最大提高率为28.9%。通过合理的加固形式,在GCS RC梁的屈服破坏阶段打破了CFRP的破坏模式,提高了CFRP利用率。CFRP加固层、预裂宽度对加固梁的力学性能和变形性能有显著影响。独创性/价值与ECS RC梁相比,GCS RC梁的承载力和刚度与ECS RC梁相差无几,甚至更好,表明GCS RC梁可行且有效。它是碳纤维布加固梁的一种新方法,不仅符合国家生态文明建设的理念,而且为结构加固提供了一种经济、环保、性能优异的解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental study on performance of CFRP-strengthened RC beams with geopolymer and epoxy
PurposeIn this paper, to obtain shear and bending performance of carbon fiber-reinforced polymer (CFRP)-strengthened beams bonded by geopolymers, the effects of impregnated adhesive types, strengthened scheme, CFRP layer and pre-cracked width are investigated, and the performance of CFRP-strengthened beams is validated by the establishment of Finite Element Models (FEMs).Design/methodology/approachIn this paper, static loading test and finite element analysis of epoxy-CFRP-strengthened (ECS) and geopolymer-CFRP-strengthened (GCS) were carried out, and the bearing capacity and stiffness were compared, the results show that GCS reinforced concrete (RC) beam is feasible and effective.FindingsThe bearing capacity, crack distribution and development, load–deflection curves of GCS RC beams with different pre-crack widths were investigated. The reinforcement effect of geopolymer achieves the same as epoxy, effectively improving the ultimate bearing capacity of the beam, with a maximum increase rate of 28.9%. The failure mode of CFRP is broken in the yield failure stage of GCS RC beam with reasonable strengthening form, and the utilization rate of CFRP is improved. CFRP-strengthened layers, pre-cracked widths significantly affect the mechanical properties, and deformation properties of the strengthened beams.Originality/valueCompared with ECS RC beams, the bearing capacity and stiffness of GCS RC beams are similar to or even better, indicating that GCS RC beam is feasible and effective. It is a new method for CFRP-strengthened beams, which not only conforms to the concept of national ecological civilization construction, but also provides an economical, environmentally friendly and excellent performance solution for structural reinforcement.
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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