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Behavior of RC columns confined with CFRP using CSB method under cyclic axial compression

机译：循环轴向压缩下CSB法约束CFRP的RC柱的性能

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摘要

It is the aim of this study to investigate the influences of the recently developed corner strip-batten (CSB) technique on reinforced concrete (RC) columns strengthened with carbon fiber reinforced polymer (CFRP) under cyclic axial loading. In CSB technique, CFRP battens do not undergo any curvature in transverse strengthening the specimen but are stretched as flat sheets. For the purposes of this study, 11 one-third scale RC columns were subjected to cyclic axial loading. The columns were strengthened with transverse FRP sheets using the three confining techniques of FRP composites employed as wraps, corner strip-wrap (CSW), and CSB. Furthermore, the two different strengthening procedures of externally bonded reinforcement on grooves (EBROG) and externally bonded reinforcement (EBR) were employed for bonding longitudinal composite strips. Results revealed that the columns confined using the CSB method exhibited improved load carrying capacity, ductility, equivalent damping ratio, energy dissipation, and secant stiffness under cyclic axial compression loading by 41.9%, 102.5%, 47.6%, 31.0%, and 25.9%, respectively, when compared with the reference column. Moreover, EBROG was discovered to have a significantly greater contribution to delaying the buckling of longitudinal CFRP composites and to improving column performance than did the conventional EBR technique. Finally, based on the compressive stresses of the carbon fibers in CFRP, the EBROG technique led to higher values of compressive strength of FRP sheets. (C) 2019 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是研究在循环轴向载荷下，最新开发的角钢-板条（CSB）技术对碳纤维增强聚合物（CFRP）增强的钢筋混凝土（RC）柱的影响。在CSB技术中，CFRP板条在横向加固样品时不会发生任何弯曲，而是被拉伸成平板状。为了本研究的目的，对11个三分之一比例的RC柱进行了循环轴向载荷。使用FRP复合材料的三层约束技术（用作包裹层，角钢带包裹层（CSW）和CSB）对柱进行横向FRP加固。此外，采用了两种不同的加固方法，分别是在沟槽上进行外部粘结加固（EBROG）和进行外部粘结增强（EBR）粘结纵向复合材料条。结果表明，在循环轴向压缩载荷下，采用CSB方法约束的柱子的承载能力，延展性，等效阻尼比，能量耗散和割线刚度提高了41.9％，102.5％，47.6％，31.0％和25.9％，与参考栏比较时。此外，与传统的EBR技术相比，发现EBROG在延迟纵向CFRP复合材料的屈曲和改善色谱柱性能方面具有显着更大的贡献。最后，基于CFRP中碳纤维的压缩应力，EBROG技术导致FRP板的压缩强度值更高。 （C）2019 Elsevier Ltd.保留所有权利。

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