Research on Restoring Force Model Characteristics of Prestressed Steel Reinforced Concrete Frames

Abstract

On the basis of reasonable selection of material constitutive model, the numerical model of singlebay prestressed section steel-concrete frame. was constructed by using ABAQUS and Open SEES finite element software, respectively, and numerical analyses of the whole process of monotonic and hysteretic force were carried out, and the hysteretic characteristics of this type of frame. structure were analyzed. The main parameters affecting the hysteresis characteristics of this type of frame. were determined through parametric analysis, and the restoring force model was established as a result. The results show that: the numerical model constructed by ABAQUS software can intuitively reflect the damage morphology and stress distribution of the frame, and the simulated peak load is 191kN, with an error of 10% from the test; the numerical model constructed by OPENSEES finite element software can macroscopically reflect the energy-consuming capacity of the frame, and the simulated peak load is 186kN, with an error of 12% from the test; both the axial compression ratio and the length to slenderness ratio are sensitive parameters of prestressed steel and concrete members, the load capacity of the specimen increases with the increase of the design axial compression ratio, and decreases with the increase of the length and slenderness ratio, but too small length and slenderness ratio leads to the destruction of the specimen faster, which is not conducive to the ductility of the specimen; the prestressing effect on the ductility of the hysteresis curve is not obvious; according to the mechanical properties of the section, the geometrical parameters of the member, the restoring force constructed by means of linear regression can be a good fit for this type of frame.