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Axial behavior of carbon fiber-reinforced polymer–confined recycled aggregate concrete-filled steel tube slender square columns
Advances in Structural Engineering ( IF 2.6 ) Pub Date : 2021-07-19 , DOI: 10.1177/13694332211033964
Jiongfeng Liang 1 , Siqi Lin 2 , Mizan Ahmed 3
Affiliation  

The behavior of fiber-reinforced polymer (FRP)–confined recycled aggregate concrete-filled steel tube (RACFT) columns is barely studied. Especially, that of slender specimens has not been investigated so far. In this article, an experimental test of FRP-confined RACFT slender square columns was conducted to study the influences of recycled aggregate (RA) replacement ratios, FRP thicknesses, and wrapping schemes on their axial behavior. Results in this article suggest that the RA replacement ratio barely affects the initial stiffness of load-deflection curves of specimens. Moreover, the specimen with a higher RA replacement ratio has a lower axial stress but larger strain at the peak point. The external FRP jackets (either partial or full wrap) can effectively improve the performance of axially loaded RACFT columns, and the improvement of ductility due to the increase of the FRP thickness is more significant than that of axial compressive strength. Additionally, it was found that the axial strength and ultimate axial strain decrease with increasing slenderness ratios. Furthermore, the influences of slenderness ratios on the behavior of such columns are more significant for the column with a larger length-to-width ratio. Finally, a design model for FRP-confined RACFT slender square columns is developed, which can predict the results of the present test accurately.



中文翻译:

碳纤维增强聚合物约束再生骨料钢管混凝土细长方柱的轴向性能

纤维增强聚合物(FRP)约束再生骨料钢管混凝土(RACFT)柱的行为几乎没有研究。特别是,迄今为止还没有研究过细长标本的情况。在本文中,对 FRP 约束的 RACFT 细长方柱进行了实验测试,以研究再生骨料 (RA) 替代率、FRP 厚度和包裹方案对其轴向行为的影响。本文中的结果表明,RA 替代率几乎不影响试件载荷-挠度曲线的初始刚度。此外,具有较高 RA 替代率的试样具有较低的轴向应力,但在峰值点处具有较大的应变。外部 FRP 护套(部分或全包)可有效提高轴向受力 RACFT 柱的性能,FRP厚度的增加对延性的提高比轴压强度的提高更显着。此外,还发现轴向强度和极限轴向应变随着长细比的增加而降低。此外,长宽比较大的柱体长细比对柱体性能的影响更为显着。最后,建立了 FRP 约束 RACFT 细长方柱的设计模型,可以准确地预测本试验的结果。长宽比越大的立柱,长细比对立柱行为的影响越显着。最后,建立了 FRP 约束 RACFT 细长方柱的设计模型,该模型可以准确预测本试验的结果。长宽比越大的立柱,长细比对立柱行为的影响越显着。最后,建立了 FRP 约束 RACFT 细长方柱的设计模型,该模型可以准确预测本试验的结果。

更新日期:2021-07-20
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