Fiber reinforced polymer (FRP) composites can be efficient for flexural strengthening of flat slabs if debonding of the FRP is postponed. However, with the increase of the flexural capacity, the flat slab becomes more susceptible to punching shear failure. In this context, four flexural or simultaneous flexural and punching shear retrofitting systems are investigated in this study to strengthen a flexure‐deficient flat slab. Externally Bonded Reinforcement on Grooves (EBROG) and externally bonded reinforcement (EBR) methods are used for flexural strengthening in two cases: slabs without punching shear reinforcement and with post‐installed shear bolts as shear reinforcement. According to the results, flexural strengthening of the slab using the EBR and EBROG techniques increased its load capacity by 12% and 21%, respectively. Simultaneous flexural and shear strengthening of the slab using the EBROG technique was the most effective, leading to a 57% enhancement of the load capacity. For specimens whose failure was governed by punching, comparing the results with code predictions showed that Eurocode and ACI (and the respective guide documents fib bulletin 90 and ACI 440.2R) overestimated the capacity of these specimens. In cases where failure was governed by flexure, a simple application of the yield line theory predicted reasonably well the load capacity of the specimens.

中文翻译：

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通过安装后的螺栓和通过EBR和EBROG粘结的CFRP复合材料对不足的平板进行抗剪和抗弯加固

如果推迟FRP的粘结，则纤维增强聚合物（FRP）复合材料可以有效地增强平板的抗弯强度。但是，随着抗弯能力的增加，平板变得更容易受到冲切剪切破坏。在这种情况下，本研究研究了四个挠性或同时挠性和冲剪剪切改造系统，以增强挠曲缺陷的平板。在两种情况下，采用外部粘结的沟槽加固（EBROG）和外部粘结的加固（EBR）方法：无冲剪增强和后安装剪力螺栓作为增强的平板。根据结果​​，使用EBR和EBROG技术的平板抗弯加固分别将其承载能力提高了12％和21％。使用EBROG技术同时对板进行抗弯和抗剪加固是最有效的，从而使承载能力提高了57％。对于通过冲孔来控制失效的样品，将结果与规范预测进行比较表明，Eurocode和ACI（以及相应的指导文件fib公告90和ACI 440.2R）高估了这些样品的能力。如果失效是由挠曲控制的，则屈服线理论的简单应用就可以合理地预测样品的承载能力。将结果与代码预测结果进行比较表明，Eurocode和ACI（以及相应的指导文件fib公告90和ACI 440.2R）高估了这些标本的容量。如果失效是由挠曲控制的，则屈服线理论的简单应用就可以合理地预测样品的承载能力。将结果与代码预测结果进行比较表明，Eurocode和ACI（以及相应的指导文件fib公告90和ACI 440.2R）高估了这些标本的容量。如果失效是由挠曲控制的，则屈服线理论的简单应用就可以合理地预测样品的承载能力。