Simulation On The Compressive Behavior Of High-strength Concrete Confined With High-strength Stirrup

Compared with ordinary concrete,high strength concrete has higher compressive strength and larger elastic modulus,but also inevitably has obvious brittleness and poor lateral deformation ability.High-strength concrete confined with high-strength stirrup(HSCCHS)is a widely accepted method to improve the deformability and strength of high-strength concrete structures.It is a key step to modify the existing code of concrete structure design and to further promote the structural members of high strength concrete.Based on the basic research on the performance analysis of HSCCHS under axial pressure,this paper first discussed the factors that had influence on the strength and ductility,analyzed the confinement mechanism and analyzed the constitutive model of influencing factors of HSCCHS.Comparative analysis of stress-strain relationship model of HSCCHS was also conducted.The results are compared and the fitting effect and effectiveness of the model are verified,which lays the foundation for the finite element analysis of the high-strength stirrup-constrained high-strength concrete members.The axial constitutive model for HSCCHS was developed based on the OpenSees platform and the model was integrated into the OpenSees program.The simulation results and experimental results are compared and the fitting effectiveness of the model are verified,which established the foundation for the finite element analysis of the HSCCHS members.The nonlinear finite element analysis of eccentric compression performance of HSCCHS columns was conducted with the zero-length element and cross-section analysis based on the developed stress-strain constitutive model to further verify the validity and practicability of the model,which will provide technical support for the subsequent analysis of mechanical properties on the structural level.