Author/Authors :
Hejabi، Hadi نويسنده He is currently nishing his PhD degree at Amir Kabir University of Technology , , Kabir، Mohammad Z. نويسنده ,
Abstract :
In this study, a nonlinear procedure for analysis of a membrane element of
a FRP strengthened concrete beam-column joint is proposed, based on a softened truss
model. The procedure employs three equations for equilibrium, three for compatibility,
and six for the constitutive laws of materials. The model is capable of analysing the
nonlinear behaviour of RC beam-column joints under cyclic loading, and has three major
attributes: nonlinear association of stress and strain in the presence of FRP, contribution
of concrete damage by means of a softening coecient, and consideration of the bond e ect
between steel, FRP and concrete. The proposed model is applied to some previously tested
and strengthened beam-column joints, and shows good predictions of their shear strength.
The e ect of various parameters on the response of a reinforced concrete beam-column
joint, such as a column axial load, amount of FRP reinforcement, and FRP properties, has
been studied in a parametric manner. It is observed that even a low quantity of FRP can
enhance the shear capacity of the joint signi cantly. Also, it is observed that the axial load
increases the con nement of the joint care, which, in turn, increases the shear capacity of
the joint.
