Research On Seismic Performance Of Steel Reactive Powder Concrete Column

Steel reinforced concrete columns have been widely used because of their high bearing capacity and good durability,and the bearing performance of this type of components can be further improved by using reactive powder concrete.In order to deeply study the seismic performance of steel reactive powder concrete columns,this paper mainly conducts low-cycle repeated load tests on four steel reactive powder concrete columns.And the finite element model of the steel reactive powder concrete column was constructed by ABAQUS software,and the bearing performance of the steel reactive powder concrete column was explored by unidirectional displacement loading,and compared with the test results,the research results show that:（1）All steel reactive powder concrete columns suffered bending failure.In the early stage of loading,the specimen was in the elastic stage,and there were no obvious cracks on the surface of the reactive powder concrete;As the horizontal displacement increases,the cracks begin to increase,accompanied by the crisp sound of steel fiber bursting;in the later stage of loading,due to the steel fiber on the aggregate The occlusal effect of the plastic hinge area does not fall off in a large area,and the anti-spalling effect is good.（2）With the increase of axial compression ratio,increase the ultimate bearing capacity of the specimen,intensity attenuation speed at the same time,a significant reduction in the energy dissipation and ductility.With the increase of reinforcement steel ratio and volume ratio,horizontal bearing capacity of the specimens has been enhanced,the hysteresis curve more full,smooth,ductility,intensity attenuation.The main reason is that both the section steel and the stirrup can enhance the restraint on the reactive powder concrete,thus limiting the cracking of the reactive powder concrete and improving the plastic deformation capacity of the specimen.（3）The finite element model of the steel reactive powder concrete column was constructed by ABAQUS software,and the mechanical properties of the steel reactive powder concrete column were explored by unidirectional displacement loading.And after a large number of parameter analysis,it is concluded that the axial compression ratio and the shear span ratio are important factors affecting the mechanical properties of the specimen.With the increase of the axial compression ratio,the ductility of the specimen decreases;with the increase of the shear span ratio,the peak load of the column specimen decreases and the ductility increases.（4）According to the current specification,provides two kinds of reactive powder concrete tensile strength,the bearing capacity of normal steel reactive powder concrete column correction method.According to the position of the neutral axis,a formula for calculating the bearing capacity of the positive section of the reinforced reactive powder concrete column is proposed,and the calculation result of the formula is close to the test.Finally,the load-displacement restoring force model of steel reactive powder concrete column is obtained by regression analysis through a large number of parameter analysis results,which is in good agreement with the test results.