Effect of Wrap Thickness and Ply Orientation on Cracking and Failure of FRP-Wrapped Columns
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The concrete structures deteriorate because of its exposure to adverse environmental conditions. It starts with corrosion of reinforcement, cracking, scaling, and which further cause spalling of concrete. These affect the strength and reduce the overall design life of the structure. The solution to this problem is fiber-reinforced polymer (FRP) jacketing which is one of the most effective retrofitting techniques available today. FRP jacketing is widely used nowadays because of its advantages such as high strength-to-weight ratio, corrosion resistant, and ease of application. In actual practice, columns are subjected to axial load along with uniaxial or biaxial bending due to unsymmetrical loading pattern. The aim of this study was to assess the effect of change in wrap thickness and ply orientation on the compressive strength of the column loaded axially and biaxially. The objectives of this study were to examine the composite action of the GFRP laminates at different load levels and to understand the associated cracking and failure analysis. Further, increase in wrap thickness, increases the load carrying capacity and ductility of the section. It is observed that change in ply orientation other than hoop direction adversely affects the load carrying capacity of the section.
KeywordsCracking Failure analysis Biaxial columns Fiber-reinforced polymer Retrofitting
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