Experimental Study On The Effect Of Reinforcement Form On The Seismic Performance Of Cylinders

Regional confined refers to a confined body formed by strengthening constraints on a specific area in a structural member,which can effectively improve the overall bearing capacity and ductility of the member.In order to improve the mechanical performance of the cylinder,a new type of stirrup--integral stirrup is designed in the Technical Code for Regional Confined Concrete Structures.In this paper,the seismic behavior of four regional confined columns with integrated stirrups,two normal confined concrete columns with different stirrups,and one centre confined concrete column under low cycle reciprocating load are studied.Analyzed the damage form of column under different reinforcement form and form of reinforcement,reinforcement ratio,confined intensity,axial compression ratio on the hysteretic energy dissipation of the specimens,the influence of the bearing capacity,ductility,at the same time using the ABAQUS finite element software to do the corresponding simulation analysis,contrast analysis of the 7 seismic performance of the specimens,the column form of reinforcement in order to find a better seismic performance.The main research results are as follows:Compared with normal and centre columns,the energy dissipation capacity,bearing capacity and ductility coefficient of regional confined concrete columns are increased by 38.1%,25% and 40.9% respectively,indicating that the zone-constrained integrated hoop-type can greatly improve the energy dissipation capacity,bearing capacity and ductility of the columns.Under the same reinforcement form,the mechanical properties of the cylinder increase with the increase of the constraint strength.The mechanical properties of the integrated stirrups columns can be maximized in the range of axial compression ratio from 0.9 to 1.1.The research results of integrated stirrups concrete columns will contribute to the popularization and application of regional confined concrete structures and promote the development and application of concrete structures.