Abstract
The implementation of shape modification (SM) to reinforced concrete (RC) columns has been demonstrated to be effective when enhancing the effectiveness of the fiber-reinforced polymer (FRP) confinement of the columns, particularly for non-circular columns. The SM approach generally includes modifying a square section into a circular one, modifying a rectangular section into an elliptical/oval one and modifying a square/rectangular section into a curvilinearized square/rectangular section. In this paper, a state-of-the-art review of studies on FRP-confined non-circular columns with SM is conducted. The effects of key parameters on the effectiveness of FRP confinement are discussed, and different methods for the implementation of SM in real applications are briefly introduced. The findings of the review further confirm the effectiveness of the SM approach, and the test results demonstrate the effectiveness and advantages of section curvilinearization with a limited increase in cross-sectional area. Additionally, existing theoretical models for FRP-confined concrete in columns with SM are summarized. Further research opportunities associated with FRP-confined non-circular columns with SM are identified.
Highlights
Fiber-reinforced polymer (FRP) composites have been widely used for strengthening engineering structures [1,2,3,4,5,6,7,8,9,10,11]
The findings of the review further confirm the effectiveness of the shape modification (SM) approach
Further research opportunities associated with fiber-reinforced polymer (FRP)-confined non-circular columns with SM are identified
Summary
Fiber-reinforced polymer (FRP) composites have been widely used for strengthening engineering structures [1,2,3,4,5,6,7,8,9,10,11]. The corners can be rounded before SC in practical applications (Zhu et al [59]) so that the span of the section is reduced, and the rise of the curved side is subsequently reduced, leading to a reduced increase in the cross-sectional area of the strengthened column. For a comparison of the effectiveness of the two forming methods, Zhu et al [59] conducted a finite element analysis, and it was found that the predicted stress–strain curves of concrete in CRCs using the two different SC methods are almost identical This suggests that the curvature of the flat side and the corner radius ratio are the two key parameters affecting the behavior of concrete in FRP-confined CSCs, as will be reviewed in the subsequent section. It should be mentioned that the Chinese standard (GB 50608 [35]) recommends that the crosssection area of the original section before SM be used in the calculation of axial stress for a curvilinearized column to ensure a conservative approach
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