Study On Seismic Behavior Of Reinforced Concrete Special-shaped Columns Strengthened With Carbon Fiber Sheets

The special-shaped column refers to a column whose cross section is L-shaped,T-shaped,cross-shaped,etc.This type of column can effectively avoid obvious corners,reduce the weight of the structure,and make the interior layout of the building more beautiful.Although the special-shaped column has many advantages,the research on the seismic performance of reinforced concrete special-shaped columns reinforced with carbon fiber cloth is still lacking.Therefore,the research on the seismic performance of CFRP reinforced concrete special-shaped columns will become an important issue.In order to study the seismic performance of reinforced concrete special-shaped columns strengthened with carbon fiber sheets,28 reinforced concrete special-shaped columns were designed.A reasonable model was established by the finite element ABAQUS software,and the axial compression ratio,limb height ratio,CFRP layers were controlled by controlling the axial compression ratio.Number,concrete strength and other working conditions to study the seismic performance of reinforced concrete special-shaped columns.The research work of this article includes:1.The reasonable material parameters and constitutive relationship were selected to establish the correct finite element model of reinforced concrete special-shaped columns reinforced with carbon fiber cloth.The correctness of the reinforced concrete finite element model was verified based on the existing references.The research shows that the finite element software simulation results and test errors are small,and the error is controlled within9%.This shows that the model established by the finite element software in this paper is reasonable and feasible.2.The hysteresis curve,ultimate bearing capacity,load-displacement curve,energy dissipation coefficient and equivalent viscosity were simulated by controlling factors such as axial compression ratio,limb height ratio,CFRP cloth layer,concrete strength and other factors.Hysteretic damping coefficient and other parameters are used to study the effect of different working conditions on the seismic performance of special-shaped columns.The results show that the energy dissipation coefficient and the equivalent viscous damping coefficient decrease gradually with the increase of the axial compression ratio,and the decreasing range becomes smaller and smaller.With the increase of the limb height ratio,the energy dissipation capacity of the sample is increased.Increase,and increase in amplitude decrease;in the axial compression ratio is 0.4,the ratio of the axial compression ratio is 0.6,the energy dissipation capacity of the test piece increases;with the increase of the number of CFRP cloth,the ultimate bearing capacity of the sample It will increase,but the increase will decrease.The reinforcement effect when the axial pressure ratio is 0.6 is better than the reinforcement effect with the axial pressure ratio of 0.4.With the increase of the concrete strength,the total energy consumption of the specimen increases,but the increase amplitude decreases.3.According to the results of finite element analysis,it provides scientific basis for the practical application of the project and follow-up scholars.