Numerical Analysis On Shear Behavior Of RC Joints With Low Rate Of Stirrup By BFRP

Reinforced concrete structure is being used in large scale with the advantages of flexible arrangement, light weight, good integrity in city construction. The joints which connect the frame beam and column are the important parts in the frame structure, Play a role of transfering and distributing the internal force, ensuring the integrity of the framework, Coordinating deformation of beam, plate, column between various artifacts, etc. The reinforced concrete structure, which is composed of beam, column and joint, is the truss structure, and the lateral stiffness is relatively low. Especially in the part of the joints, the stress is more complicated, and the stress concentration phenomenon is very obvious in the core area. A large number of earthquake damage shows that the joints are the position where the destruction is more concentrated in the frame structure and the weakest parts of the structure. Especially for some joints whose core area have a serious shortage of stirrups, Because of the design and construction phase, are easy to cause shear failure under the seismic load, therefore, it is very urgent to strengthen the shear strength of R.C joints with low rate of stirrup.In order to study the shear behavior of BFRP fiber reinforced concrete joints with low rate of stirrup, this paper intends to carry out the following research work.(1). Firstly, Establish the finite element model of joints with low rate of stirrup and analyze which refers to the existing research data in the literature. Compare the simulation results with the experimental data in order to verify the reliability of finite element software simulation.(2). Establish the finite element model of joints with low rate of stirrup with different reinforcement forms and analyze. And reveal the shear resistance mechanism of the joints strengthened by BFRP through the analysis of the simulation results.(3). Sum up the shear formula of BFRP reinforcement joints refering to the relevant formula in the existing norms, through the analysis of the shear resistance mechanism of BFRP reinforced joint with low rate of stirrup.(4). A practical example is provided to confirm that the shear formula of BFRP reinforcement joints is reliability. Discuss the conditions of application and optimization suggestions of BFRP reinforced concrete joints, and provide a reference for the practical engineering of shear reinforcement.In this paper, though the finite element analysis carried out on the steel reinforced concrete joints with different reinforcement forms, different reinforcement layers, and different axial compression ratios, reveal the shear resistance mechanism of the joints strengthened by BFRP. And sum up the shear formula of reinforcement joints by BFRP, under different conditions.