Integrated Analysis of Reinforced Concrete Columns Retrofitted With Fibre-Reinforced Polymer

Abstract eng:
Use of fibre-reinforced polymer (FRP) in the strengthening of seismic-deficient columns is becoming increasingly common; however, the nonlinear analysis of frame structures containing such members poses several challenges. At the component-level, analyzing damage effects, confinement enhancement, buckling of longitudinal bars, and bondslip effects at the interface of concrete and FRP sheets require finely detailed finite element (FE) models. At the system-level, force redistribution due to stiffness changes between different components can affect the response of the column, especially when the structure experienced damage prior to retrofitting. An integrated framework was recently developed which enables analysis of reinforced concrete (RC) structures at both the component- and system-level in a concurrent fashion. In this modelling approach, the critical components of the structure such as retrofitted columns are modelled in a detailed FE program while the rest of the structure is modelled in a computationally efficient frame analysis program. Herein, the application of the framework to retrofitted columns is demonstrated by modelling and analyzing several test specimens. The procedure is found to simulate the experimental behaviour of the specimens examined with a high level of accuracy. The influence of damage effects, FRP-related mechanisms, and buckling of longitudinal bars are investigated in detail. In addition, the strength and ductility enhancement effects of RC columns repaired with FRP wraps are demonstrated at system-level through multi-scale modelling of a bridge structure.

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