Techno Press

Structural Engineering and Mechanics   Volume 61, Number 3, February10 2017, pages 407-417
Modeling of RC shear walls strengthened by FRP composites
Mohammed A. Sakr, Saher R. El-khoriby, Tarek M. Khalifa and Mohammed T. Nagib

Abstract     [Full Text]
    RC shear walls are considered one of the main lateral resisting members in buildings. In recent years, FRP has been widely utilized in order to strengthen and retrofit concrete structures. A number of experimental studies used CFRP sheets as an external bracing system for retrofitting of RC shear walls. It has been found that the common mode of failure is the debonding of the CFRP-concrete adhesive material. In this study, behavior of RC shear wall was investigated with three different micro models. The analysis included 2D model using plane stress element, 3D model using shell element and 3D model using solid element. To allow for the debonding mode of failure, the adhesive layer was modeled using cohesive surface-to-surface interaction model at 3D analysis model and node-to-node interaction method using Cartesian elastic-plastic connector element at 2D analysis model. The FE model results are validated comparing the experimental results in the literature. It is shown that the proposed FE model can predict the modes of failure due to debonding of CFRP and behavior of CFRP strengthened RC shear wall reasonably well. Additionally, using 2D plane stress model, many parameters on the behavior of the cohesive surfaces are investigated such as fracture energy, interfacial shear stress, partial bonding, proposed CFRP anchor location and using different bracing of CFRP strips. Using two anchors near end of each diagonal CFRP strips delay the end debonding and increase the ductility for RC shear walls.
Key Words
    finite element model; RC shear walls; cohesive interaction; CFRP; strengthening; debonding
Mohammed A. Sakr, Saher R. El-khoriby, Tarek M. Khalifa and Mohammed T. Nagib : Department of Structural Engineering, Tanta University, Tanta, Egypt

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