Analytical study on the behaviour of concrete in-filled FRP tubular columns subjected to lateral cyclic loading
Abstract
The purpose of this paper is to present a three-dimensional non-linear finite element analysis of concrete in-filled fiber-reinforced polymer (FRP) tubular columns subjected to lateral cyclic loading. Stress-Strain Confined model, Hashin's damage failure model, and plasticity model were used to model concrete, fiber-reinforced polymer tubes and steel reinforcement inside the tubes. The parameters involved in this study are strength of concrete, fiber orientation, thickness of the tube, and interfacial bonding. The load-deflection behaviour and failure patterns were investigated using finite element analysis. The results obtained from this numerical study that concrete in-filled FRP tubular columns with 5mm tube thickness showed higher load carrying capacity compared to columns with 3mm tube thickness. The results revealed that concrete in-filled FRP tubular columns with fiber orientation in hoop direction (00) have higher load carrying capacity and ductility when compared to columns with fiber orientation of 300 and 530. The results showed that there is no considerable difference in interfacial bonding of the concrete in-filled FRP tubular columns with different co-efficient of friction between FRP tubes and concrete.
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