用 GFRP 螺旋筋加固的混凝土短柱的应变行为

Loai Alkhattabi, Ahmed H. Ali, H. Mohamed, Ahmed Gouda
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摘要

本文介绍了一项综合研究,重点是评估在同心轴向压缩荷载作用下,用玻璃纤维增强聚合物(GFRP)钢筋和螺旋形钢筋加固的混凝土短柱内产生的应变。这项研究的动机是文献中缺乏有关此类柱子应变的充足数据。研究人员铸造并测试了五根全尺寸 RC 柱,其中四根使用 GFRP 加固,一根使用钢筋和螺旋加固。这项研究全面考察了各种试验参数(如钢筋类型、纵向钢筋比例和螺旋钢筋间距)对混凝土、GFRP 钢筋和螺旋钢筋应变的影响。实验结果表明,GFRP-RC 柱在达到其峰值荷载的 85% 时与钢-RC 柱表现出相似的应变行为。研究还强调,随着配筋率和螺旋间距的优化,柱子的承载能力最多可提高 25%,而随着配筋率的增加,破坏模式从韧性过渡到脆性。此外,最好将 GFRP 钢筋的压缩应变限制在其极限拉伸应变的 20% 以下,将 GFRP 螺旋应变限制在其极限应变的 12% 以下,以确保在 RC 柱中安全可靠地使用这些材料。本研究还考虑了使用允许在受压构件中使用玻璃钢条的既定设计标准(即 ACI 440.11-22、CSA-S806-12 和 JSCE-97)预测轴向承载能力的问题,并强调了这些标准在准确预测 GFRP-RC 柱破坏能力方面的局限性。考虑到混凝土、螺旋约束和纵向 GFRP 杆件的轴向刚度的贡献,本研究提出了一个方程来提高 GFRP-RC 柱的预测精度。该方程解决了现有设计标准的不足,为 GFRP-RC 柱的轴向承载能力提供了更准确的评估。在使用该方程式估算从文献中收集的 42 根支柱的强度时,其性能优于不同研究人员提出的其他许多方程式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Strain Behavior of Short Concrete Columns Reinforced with GFRP Spirals
This paper presents a comprehensive study focused on evaluating the strain generated within short concrete columns reinforced with glass-fiber-reinforced polymer (GFRP) bars and spirals under concentric compressive axial loads. This research was motivated by the lack of sufficient data in the literature regarding strain in such columns. Five full-scale RC columns were cast and tested, comprising four strengthened with GFRP reinforcement and one reference column reinforced with steel bars and spirals. This study thoroughly examined the influence of various test parameters, such as the reinforcement type, longitudinal reinforcement ratio, and spacing of spiral reinforcement, on the strain in concrete, GFRP bars, and spirals. The experimental results showed that GFRP–RC columns exhibited similar strain behavior to steel–RC columns up to 85% of their peak loads. The study also highlighted that the bearing capacity of the columns increased by up to 25% with optimized reinforcement ratios and spiral spacing, while the failure mode transitioned from a ductile to a more brittle nature as the reinforcement ratio increased. Additionally, it is preferable to limit the compressive strain in GFRP bars to less than 20% of their ultimate tensile strain and the strain in GFRP spirals to less than 12% of their ultimate strain to ensure the safe and reliable use of these materials in RC columns. This research also considers the prediction of the axial load capacities using established design standards permitting the use of FRP bars in compressive members, namely ACI 440.11-22, CSA-S806-12, and JSCE-97, and underscores their limitations in accurately predicting GFRP–RC columns’ failure capacities. This study proposes an equation to enhance the prediction accuracy for GFRP–RC columns, considering the contributions of concrete, spiral confinement, and the axial stiffness of longitudinal GFRP bars. This equation addresses the shortcomings of existing design standards and provides a more accurate assessment of the axial load capacities for GFRP–RC columns. The proposed equation outperformed numerous other equations suggested by various researchers when employed to estimate the strength of 42 columns gathered from the literature.
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