Abstract
The main goal of the work herein presented is to propose an accurate three-dimensional finite element model to predict the compressive behaviour of hybrid FRP-confined concrete. This was achieved through the modification of the concrete damaged plasticity model (CDPM) available in ABAQUS software, since the original CDPM has shortcomings that make it unusable to predict the compressive behaviour of confined concrete. It was demonstrated that, by turning the yield function and the flow rule dependents on the confining pressure, it is possible to use the model referred to and obtain accurate results.An analytical model was used to obtain the input parameters needed to calibrate the CDPM. A specific user subroutine was developed to modify the original CDPM. Hybrid FRP properties were calibrated as well, using an appropriate analytical model. Plasticity was assumed in the hybrid combinations for which pseudo-ductile tensile responses occurred. The performance of the proposed CDPM was validated using both experimental results and analytical predictions.It was concluded that, by using the developed 3D finite element model for hybrid FRP-confined concrete in compression, a very good agreement between experimental, analytical and numerical compressive stress-strain and lateral strain-axial strain curves is reached.
Highlights
In the last three decades, Fibre Reinforced Polymers (FRP) composites have been used as jackets in the confinement of concrete columns [1]
This leads to compressive behaviour of confined concrete very similar to the one that is obtained in non-hybrid FRPconfined concrete series, when these combinations are used as confining materials, as it is evident from experimental results
If an analytical model that implicitly considers the frictions forces is used, to compute the input parameters of the numerical model, the end restrain does not need to be detailed
Summary
In the last three decades, Fibre Reinforced Polymers (FRP) composites have been used as jackets in the confinement of concrete columns [1]. According to the author’s knowledge, up to the current date, an accurate finite element (FE) model to predict the hybrid FRP-confined concrete compressive behaviour has not been developed yet As it is known, such models allow modelling the three-dimensional behaviour of confined concrete subjected to complex stress states. Modified plasticity-damage models [34,35,36,37], based on the proposed models of Lubliner et al [38] and Lee and Fenves [39], have been suggested as the best models to predict axial compression responses of FRPconfined concrete columns To achieve this goal, the confinement-dependent characteristics of FRP-confined concrete have to be incorporated into the yield function, flow rule, and damage variable [34]. Comparisons with experimental and analytical results show that the predictions of the proposed model are in close agreement with measured parameters
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