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Numerical and theoretical investigation for the flexural behaviour of geopolymer concrete beams reinforced with hybrid FRP /steel bars
Journal of Building Engineering ( IF 6.7 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.jobe.2025.111883
Ahlam Jebur Kadhim, Othman Hameed Zinkaah

Recent studies have demonstrated the effectiveness of Fibre Reinforced Polymer (FRP) and steel bars as longitudinal reinforcement for Geopolymer Concrete (GPC) beams. However, research on the combined performance of these materials in hybrid FRP/steel-reinforced GPC (HRGPC) beams remain limited. This study addresses this gap using finite element (FE) analysis with ABAQUS software and theoretical modeling, validated against available experimental data, to investigate the flexural behaviour of HRGPC beams. The results showed strong agreement between FE analysis and experimental findings regarding failure modes, load-deflection, and load-strain response. Parametric studies revealed key factors influencing flexural performance, including compressive strength, reinforcement ratio, FRP reinforcement type, and the presence of openings. Compressive strength showed a limited effect on flexural behaviour, so doubling it from 30 to 60 MPa resulted in only a 12 % increase in load capacity due to steel bars yielding. The results showed a significant impact on the ratio of FRP to steel bars (Af/As). A 50 % GFRP and 50 % steel bar combination increased load capacity by 12.3 % compared to steel-only reinforcement. Additionally, HRGPC beams exhibited lower deflection than those reinforced solely with FRP bars. Theoretically, the load capacity was predicted using theoretical models developed by Qu et al., Safan, and Yang et al., giving conservative results. Therefore, a new equation was developed to come up with a better estimation of the load capacity of geopolymer concrete beams reinforced with hybrid reinforcement (FRP and steel), providing a mean value, standard deviation, and coefficient of variation of 0.91, 9 %, and 10 %, respectively.

中文翻译:


FRP /钢筋混合加固地聚合物混凝土梁弯曲性能的数值和理论研究



最近的研究表明,纤维增强聚合物 (FRP) 和钢筋作为地质聚合物混凝土 (GPC) 梁的纵向加固是有效的。然而,关于这些材料在混合 FRP/钢增强 GPC (HRGPC) 梁中的综合性能的研究仍然有限。本研究使用 ABAQUS 软件和理论建模的有限元 (FE) 分析和理论建模来解决这一差距,并根据可用的实验数据进行验证,以研究 HRGPC 梁的弯曲行为。结果表明,有限元分析与失效模式、载荷-挠度和载荷-应变响应的实验结果之间具有很强的一致性。参数研究揭示了影响弯曲性能的关键因素,包括抗压强度、配筋率、FRP 配筋类型和开口的存在。抗压强度对弯曲性能的影响有限,因此将其从 30 MPa 增加到 60 MPa 由于钢筋屈服,负载能力仅增加了 12%。结果表明,FRP 与钢筋的比率 (Af/As) 有显著影响。与纯钢加固相比,50% GFRP 和 50% 钢筋组合将承载能力提高了 12.3%。此外,HRGPC 梁的挠度低于仅使用 FRP 钢筋加固的梁。从理论上讲,使用 Qu 等人、Safan 和 Yang 等人开发的理论模型预测负载能力,给出了保守的结果。因此,开发了一个新的方程式,以更好地估计混合钢筋(FRP 和钢)加固的地质聚合物混凝土梁的负载能力,平均值、标准差和变异系数分别为 0.91、9 % 和 10 %。
更新日期:2025-01-21
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