Study On T Type Corner Joint Of Reinforced Concrete Beam Column With CFRP

Reinforced concrete(RC)frame joint is one of the most important parts in frame structure,Play a role in transfer and distribute the internal forces coordinating,is the key part of structural integrity.Therefore,it is of great significance to study the reinforcement of the joints.Carbon fiber reinforced polymer(CFRP)has been widely used in many fields because of its excellent mechanical properties.In recent years,it has been widely used in the reinforcement and repair of concrete.Compared with the traditional reinforcement methods,it has been paid more attention.At present,the node CFRP reinforcement is mainly focused on the plane frame,It is not practical to use the space frame node.Therefore,this paper will study the influence of the single side straight beam on CFRP beam column T corner joint.In this paper,the finite element model with reference to the existing literature on T corner node of CFRP reinforcement.By verifying the validity of ANSYS,it is shown that the finite element simulation is suitable.On this basis,25 sets of T type corner joint reinforcement model are established.By comparing the simulation results,comparative analysis found that the bearing of capacity of CFRP reinforced joints model is obviously improved,and the deformation of the core area of the joints is better.The failure mode of the model is transformed from the shear failure of the core area of the joint to the bending failure of the beam,which improves the brittleness of the joint.Comparison of the reinforcement node of non straight beam,the existence of the straight beam in the core area in the horizontal U and vertical CFRP reinforcement are reduced,so as to reduce the binding core area effect.The strengthening effect of CFRP on inclined bar mechanism of concrete is weakened,The direction of the CFRP in the core region which approximately parallel to the principal tensile stress changed.Thus,the strengthening effect of carbon fiber cloth on the shear strength of the core area is reduced.At the same time,the parameters of the straight beam are designed,It is found that the increase of the height and width of the beam increases the magnitude of its influence on the reinforcement of the join.Also,the effect of the reinforcement on the side of a single longitudinal beam or the side of the loading end is not significant,If the beam is close to the loading end,the reinforcement efficiency will decrease slightly.