The Study Of External FRP-Angle Combination Reinforcement Node Method

Beam-column joints as the forces transmission hub of frame structure play important parts in connecting the beams and columns, coordinating component deformation and assuring the integrity of the structure. In recent years, the many times earthquake damages show that Beam-column joints is also more weaker and easiest to damage part in frame structure, the failure of nodes usually cause collapse of the whole structure. In order to reduce the damage, it is necessary for beam-column joints to carry on effective seismic reinforcement.Due to FRP having good performances of high strength and convenient construction, so it has been more widely in the practical engineering application, especially in the aspect of structure of the seismic strengthening. At present, domestic and international mainly carry on a lot of research in a single component of FRP reinforcement concrete structure, such as beam, plate, column, ect. But the study of complex beam-column joints is fewer.So it has the vital significance to study bonding of external FRP- Angle combination reinforcement frame node method.In this paper, T frame node is as the research object and establishing the three finite element model by means of finite element analysis software ANSYS. Two of them are contrast specimen(one is not reinforced, another uses FRP reinforced only), the rest is as a research specimen, it reinforced with FRP reinforcement-Angle combination. Comparing the fracture, displacement, stress and strain of each specimen, it is concluded that node fracture development, bearing capacity, ductility and failure pattern are improved after reinforced. Comparing the strengthening with FRP, the performance of nodes in the bonding of external FRP-Angle combination reinforcement have further improvement. It shows that bonding of external FRP-Angle combination reinforcement is a more effective way of strengthening. In addition, in order to discuss the influence that the different parts of the FRP paste layer, the limb length of Angle and thickness of the Angle have on the performance of node reinforcement, on the basis of combined reinforcement node model by changing the FRP parameters and Angle parameters, establishing additional 12 finite element model for comparative analysis。Analysis results show that:(1) With the increase of FRP paste layer, the shear bearing capacity and ductility of the node will be improved, but after FRP increases to a certain layer, the effect is not obvious.(2) Limb length and thickness of Angle has a certain impact on the bearing capacity and ductility of the node. The increase of limb length can improve the bearing capacity and ductility, the increase of thickness can improve the ductility of node, but the bearing capacity is not obviously improve.