Abstract The punching shear failure of a slab-column connection is a sudden catastrophic failure. The majority of studies have been focused on the strengthening aspects of non-cracked slab-column connections. However, the attention given to the retrofitting of heavily damaged slab-column connections is comparatively less. Therefore, it is crucial to investigate the suitable damage repairing methods as well as post-strengthening methods to enhance performance of damaged slab-column connections. In this study, a total of twenty-six heavily damaged medium-scale flat slab-column connections were repaired using an in-situ chip concrete mixture. Then the damage repaired specimens were retrofitted using alternative arrangements of Carbon Fiber Reinforced Polymer (CFRP) in such a way to investigate the effects of sensitivity of bond parameters on punching shear performance. The punching shear capacity enhancements observed from retrofitted connections were in the range between 20% and 90%.

中文翻译：

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碳纤维增强聚合物加固严重破损钢筋混凝土平板-柱连接性能

摘要 板柱连接冲剪破坏是一种突发的灾难性破坏。大多数研究都集中在无裂纹板柱连接的加固方面。然而，对严重损坏的板柱连接改造的关注相对较少。因此，研究合适的损伤修复方法以及后加固方法以提高受损板柱连接的性能至关重要。在这项研究中，使用原位碎屑混凝土混合物修复了总共 26 个严重损坏的中型平板柱连接。然后使用碳纤维增强聚合物 (CFRP) 的替代排列对损坏修复的试样进行改造，以研究粘结参数敏感性对冲切剪切性能的影响。从改造连接中观察到的冲切抗剪能力增强在 20% 到 90% 之间。