The beam-column joints are the most critical and vulnerable part of the RC framed structures when subjected to earthquake load. The objective of the present study is to investigate the cyclic behaviour of seismic and non-seismic exterior reinforced concrete (RC) beam-column joints strengthened with innovative polymeric based geosynthetic materials. Two variants of geosynthetic material named geogrid and geotextile were used for strengthening the beam-column joints in the experimental program. In this strengthening protocol, two different types of strengthening patterns were used in which one was horizontal U-shaped pattern, and the other one was the diagonal cross (X-shaped) pattern. All the beam-column specimens were tested under the quasi-static cyclic loading with controlled amplitude to explore the cyclic performance on the parameters such as failure modes, hysteresis loops, load-deformation envelope curves, ductility, energy dissipation capacity, stiffness and strength degradation behaviour, pinching width ratio, damage index and joint distortion. The test results showed that the adopted strengthening schemes with geotextile and geogrid materials could successfully alter the failure of beam-column joints from shear to flexural and improved the ductile behaviour of the strengthened specimens. The load-carrying capacity and ductility-factor of the geosynthetic strengthened specimens significantly increased up to 48.4% and 37.8%, respectively when compared to the non-seismic control specimen, and it was highest in geogrid strengthened BCJs, especially in diagonal X-shape bonded specimen. The significant increment of energy dissipation capacity was also observed as 2.08 to 3.73 times for the strengthened specimens. Furthermore, the post-elastic performance and the joint shear strength of strengthened RC beam-column joints was also improved in comparison to the non-seismic control specimen. In addition, an analytical study was carried out to predict the shear strength contributions of externally bonded strengthening materials in the RC beam-column joint, which was compared with experimental findings. A good agreement was observed between the analytical and experimental results. Hence, the experimental and analytical study of the strengthened beam-column joints using geotextile and geogrid have confirmed that the appropriate bonding of these materials to the concrete can improve the seismic performance of the non-seismic exterior RC beam-column joints.

当承受地震荷载时，梁柱节点是钢筋混凝土框架结构中最关键和最脆弱的部分。本研究的目的是研究用创新的基于聚合物的土工合成材料加固的地震和非地震外部钢筋混凝土（RC）梁柱节点的循环行为。在实验程序中，土工合成材料的两种变体称为土工格栅和土工织物，用于加强梁柱节点。在此加固方案中，使用了两种不同类型的加固图案，其中一种是水平的U形图案，另一种是对角十字（X形）图案。在准静态循环荷载下对所有梁柱试样进行了振幅受控的测试，以探索在诸如破坏模式，磁滞回线，荷载-变形包络曲线，延展性，能量耗散能力，刚度和强度退化等参数下的循环性能行为，收缩宽度比，损坏指数和关节变形。试验结果表明，采用土工织物和土工格栅材料的加固方案可以成功地改变梁柱节点的破坏，从剪切状态变为弯曲状态，并改善了加固后试样的延性。与非地震对照样品相比，土工合成材料增强的样品的承载能力和延性因子分别显着提高，分别达到48.4％和37.8％，在土工格栅加固的BCJ中最高，特别是在对角X形粘结试样中。增强后的试样的能量耗散能力也显着增加，为2.08至3.73倍。此外，与非地震控制标本相比，加固的RC梁柱节点的后弹性性能和节点剪切强度也得到了改善。此外，还进行了一项分析研究，以预测钢筋混凝土梁-柱节点中外部粘结的增强材料的抗剪强度贡献，并将其与实验结果进行比较。在分析结果和实验结果之间观察到很好的一致性。因此，