Stirrups Double Behavior And Finite Element Analysis Of Concrete Square Columns

High-strength concrete with double stirrups has the advantages of high capacity, gooddeformation properties, saving rebar and good economic effect, so it is a structure with broadprospects for development. With the rapid development of building materials, the high-strengthmaterials, especially high-strength concrete has been more widely used in the actual project, butits ductility is relatively poor. In order to improve the performance of high-strength concrete, theconcrete with double-stirrups can overcome the shortcomings of the concrete brittle performanceand improve concrete strength and ductility.this paper topic has important theoretical significance and practical value. In this paper, aplain concrete, four square concrete columns with single stirrups and12square concrete columnswith double stirrups are tested by axial compression. The mechanical properties of squareconcrete columns with double stirrups by axial compression are studied. The impact of stirrupspacing, the distance between the inner and outer layers of stirrups, the size of the core concretesection of the concrete on binding effect is analyzed. Determine the optimal spacing of stirrups ofconfined high strength concrete with double stirrups. And analyze the impact of stirrupcharacteristic value on the ductility. Test results show that: double stirrups can effectively restrainthe lateral deformation of reinforced concrete, and it is an obvious effect on the ultimate strengthand ductility of reinforced concrete. By means of test results and previous research, the peakstress formula、Peak strain formula and bearing capacity formula of reinforced concrete withdouble stirrups is linear regression analyzed. The mechanism of concrete confined by stirrups isanalyzed.On the basis of existing domestic and international constraints of the finite element analysisof the concrete, and according to the test results, a finite element model of the square concretecolumns with double stirrups is simulated. Computational analysis showed that simulation andexperimental results are in good agreement, and it can safely predict the mechanical behavior ofconcrete columns with double stirrups. So it can be used for such structural members’ nonlinearfinite element analysis.