The current paper reports the results of experiments on deficient exterior reinforced concrete (RC) strong beam–weak column connections strengthened with carbon fiber-reinforced polymer (CFRP) sheets. Five RC-joint specimens with half-scale size were manufactured and tested subjected to constant axial and reversed cyclic quasi-static loads. These joints consisted of one control and four specimens retrofitted with FRP sheets used in different strengthening configuration. The study is mainly directed to the examination of the different anchoring methods for longitudinal FRPs at beam–column intersection including L-shaped anchorage or CFRP anchor fans as a modern anchorage technique. Furthermore, the efficiency of transverse CFRP sheets in the form of innovative corner strip-batten technique to improve the seismic performance of the weak column was compared with longitudinal sheets. The externally bonded reinforcement on grooves (EBROG) method was also used in all strengthening schemes to eliminate surface debonding of CFRP. Test results revealed that although all the retrofitting schemes used led to significant improvements of up to 80% in strength capacity, longitudinal FRP sheets applied through the EBROG method and anchored with CFRP fans were more effective in inducing a completely ductile behavior in the joints, while the plastic hinge was also relocated into the beam.

中文翻译：

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CFRP薄板不同构型加强了强弱梁节点的循环性能

本文报道了用碳纤维增强聚合物（CFRP）板加固的不足的外部钢筋混凝土（RC）强梁-弱柱连接的实验结果。制作了五个半尺寸的RC接头试样，并对其进行了恒定的轴向和反向循环准静态载荷测试。这些接头由一个对照和四个标本组成，这些标本都用不同强度配置的FRP板翻新而成。这项研究主要针对检查梁柱交点处纵向FRP的不同锚固方法，包括作为现代锚固技术的L形锚固或CFRP锚固风扇。此外，将横向CFRP薄板以创新的角条式压条技术的形式来改善弱柱的抗震性能的效率与纵向薄板进行了比较。在所有加固方案中，还使用了外部粘结的沟槽加固（EBROG）方法，以消除CFRP的表面剥离。测试结果表明，尽管使用的所有改装方案都可以显着提高强度，最高可提高80％的强度，但通过EBROG方法应用并锚固CFRP风扇的纵向FRP板在诱导接头完全塑性方面更有效，而塑料铰链也重新放置在横梁中。在所有加固方案中，还使用了外部粘结的沟槽加固（EBROG）方法，以消除CFRP的表面剥离。测试结果表明，尽管使用的所有改装方案都可以显着提高强度，最高可提高80％的强度，但通过EBROG方法应用并锚固CFRP风扇的纵向FRP板在诱导接头完全塑性方面更有效，而塑料铰链也重新放置在横梁中。在所有加固方案中，还使用了外部粘结的沟槽加固（EBROG）方法，以消除CFRP的表面剥离。测试结果表明，尽管使用的所有改装方案都可以显着提高强度，最高可提高80％，但通过EBROG方法施加的纵向FRP片材以及CFRP风扇锚固在诱导接头完全延展性方面更为有效，而塑料铰链也重新放置在横梁中。