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PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Effects of Column Loading on the Behaviour of Concrete Joints Reinforced with Carbon Fibre Reinforced Polymer Laminates
M. Safari Gorji and K. Bargi
Department of Civil Engineering, University of Tehran, Iran
M. Safari Gorji, K. Bargi, "Effects of Column Loading on the Behaviour of Concrete Joints Reinforced with Carbon Fibre Reinforced Polymer Laminates", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 169, 2007. doi:10.4203/ccp.86.169
Keywords: reinforced concrete, beam-column joints, fiber reinforced polymer composites, stiffness, load carrying capacity, finite element.
The use of fibre reinforced polymer (FRP) composites in strengthening reinforced concrete structures has been of great interest for civil engineers in recent years. Less attention has been paid to FRP strengthening of reinforced concrete joints. It is a challenging task to investigate complex components such as beam-column joints numerically as well as experimentally. Parvin & Granata  and Mostofinejad & Talaeitaba  conducted numerical studies on the subject of strengthening reinforced concrete (RC) connections with FRP laminates. The main objective of their studies focoused on the finite element modeling of exterior RC beam-column connections strengthened with FRP laminates.
The major goal of this study has been focused on the finite element modeling of the interior beam-column joints reinforced with CFRP laminates using the available software. Effects of column forces on the behaviour of concrete joints reinforced with CFRP laminates as well as improvement of structural behaviour of joints strengthened with CFRP laminates, are discussed in the current investigation.
Nonlinear finite element analysis is performed using the ANSYS program. SOLID65, LINK8 and SOLID45 elements represent concrete, discrete reinforcing steel bars, and FRP laminates, respectively .
As a case study on an RC interior joint strengthened with FRP laminates, a base joint with two strengthening designs was analysed. In this investigation, the columns were subjected to two levels of axial forces, and lateral loads were applied to the FE joint models at top of the columns up to failure of joints model. FRP L-shaped laminates were placed to improve the diffusion of stresses between members. In order to ensure a proper anchorage, FRP laminates were installed on joints on each side of the column and the latter on both sides of the beam. Then, in order to provide the concrete of column with a higher compressive deformation capacity, FRP laminates were wrapped around column in direction parallel to internal hoops. Beam wrapping was done to ensure a good anchorage for the joint laminates.
The following conclusions can be drawn from numerical studies on concrete interior beam column connections with and without FRP reinforcement:
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