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首页> 外文期刊>Journal of Composites for Construction >Experimental Study of Circular RC Columns Strengthened with Longitudinal CFRP Composites under Eccentric Loading: Comparative Evaluation of EBR and EBROG Methods
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Experimental Study of Circular RC Columns Strengthened with Longitudinal CFRP Composites under Eccentric Loading: Comparative Evaluation of EBR and EBROG Methods

机译：纵向CFRP加固钢筋混凝土圆形RC柱的试验研究：EBR法与EBROG法的比较评价。

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摘要

Application of carbon fiber-reinforced polymer (CFRP) composites has been promoted successfully for strengthening or repairing concrete structural members. However, if a column member is strengthened with longitudinal FRP sheets in which fibers are laid parallel to the column axis, the FRP composite will soon buckle under compression to ultimately debond off the concrete surface. It is the objective of the current research to investigate the effect of the recently developed grooving method (GM) on cylindrical specimens strengthened with FRP sheets under compressive loading, and to determine whether GM postpones the buckling of FRP sheets and their debonding off the concrete substrate. For the purposes of this study, 35 cylindrical reinforced concrete specimens, 150mm in diameter and 500mm in height, were tested under compressive loading with eccentricities of zero, 30, 60, and 90mm. The specimens were additionally subjected to the four-point flexural bending test to represent infinity eccentricity. Fiber-reinforced polymer (FRP) sheets with longitudinal fibers parallel to the column axis were installed using the conventional externally bonded reinforcement (EBR) and grooving method, taking advantage of the special technique of externally bonded reinforcement on grooves (EBROG). Experimental results revealed that the grooving method was much more effective than the EBR in increasing the load-carrying capacity of the specimens. Moreover, it was found that longitudinal fibers exhibited an enhanced effect with increasing load eccentricity. The results showed that in the columns strengthened with longitudinal FRP strips using the EBROG method, the load-carrying capacity enhancements of 8.3, 12.2, 25.8, 36.0, and 53.3% relative to those of the controls were achieved for 0, 30, 60, 90mm, and infinity eccentricities, respectively.
机译：碳纤维增强聚合物（CFRP）复合材料的应用已成功推广，以增强或修复混凝土结构构件。但是，如果用纵向FRP薄板加固圆柱构件，其中纤维平行于圆柱轴线放置，则FRP复合材料将很快在压缩作用下弯曲，最终剥落混凝土表面。本研究的目的是研究最近开发的开槽方法（GM）对在压缩载荷下用FRP板加固的圆柱试样的影响，并确定GM是否推迟FRP板的屈曲和它们从混凝土基材上的剥离。 。为了本研究的目的，在压缩载荷下对35个直径150mm，高度500mm的圆柱形钢筋混凝土试样进行了测试，其偏心率为零，30、60和90mm。另外对样品进行四点弯曲弯曲测试以表示无穷大的偏心率。利用传统的外部粘结增强材料（EBR）和开槽方法，利用槽上外部粘结增强材料（EBROG）的特殊技术，安装了具有平行于柱轴的纵向纤维的纤维增强聚合物（FRP）板。实验结果表明，开槽方法在增加试样的承载能力方面比EBR有效得多。此外，发现纵向纤维显示出随着负载偏心率的增加而增强的效果。结果表明，采用EBROG方法在纵向FRP筋加固的柱中，相对于对照，在0、30、60， 90mm和无限大的偏心距。

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