Experimental Study On Seismic Performance Of Steel Reinforced High Strength Concrete Columns

Steel reinforced high strength concrete(SRHSC)column is a new type of composite structure formed by the combination of reinforced high-strength concrete column and steel.It has the advantages of high bearing capacity,good ductility and excellent seismic performance.Through the low cyclic loading tests of SRHSC columns in this paper,the influence rule of design parameters on the seismic performance of SRHSC columns is systematically analyzed,the failure pattern and stress mechanism are revealed,a theoretical model for calculating horizontal bearing capacity of SRHSC columns under different failure pattern is established.Finally,using the finite element analysis software ABAQUS to analysis finite element analysis of SRHSC columns,the main research work and conclusions are as follows:1.Conduct the low cyclic loading tests of 17 SRHSC columns,the influences of concrete strength,shear span ratio,axial compression ratio,stirrup ratio and steel ratio on the seismic performance of SRHSC columns were systematically analyzed,the failure pattern and stress mechanism of the specimen are revealed.containing 4specimens for SRHSC columns with steel fiber was conducted under low cyclic loading,As a comparison test,the influence rule of steel fiber on the failure pattern,hysteretic curve,skeleton curve,strength attenuation,energy dissipation capacity and ductility of SRHSC columns was analyzed,the conclusion which steel fiber can effectively improve the ductility and seismic performance of SRHSC columns is preliminarily obtained.2.Based on the experimental research,according to the stress mechanism of SRHSC columns in different failure pattern,the influence rule of design parameters on the horizontal bearing capacity of SRHSC columns is analyzed,and the theoretical calculation model of horizontal bearing capacity of SRHSC columns under different failure patters are established.Based on the regression analysis of the experimental data in this paper,a practical formula for calculating the horizontal bearing capacity of SRHSC columns is presented.Considering the effect of steel fiber on the flexural capacity of SRHSC columns under low cyclic loading,lead into coefficient to revise the practical calculation formula of the flexural capacity of SRHSC columns with steel fiber.3.With the help of ABAQUS finite element analysis software,established the finite element analysis model of SRHSC columns under low cyclic loading,make a comparison between simulation results and experimental results,the reliability of thefinite element model is verified.Based on this,the finite element analysis model was used to analyze the mechanical properties of SRHSC columns under low cyclic loading,and the mechanism of stress was revealed.