The Research On Seismic Behavior And Energy Dissipation Of High-Strength Stirrup Restraint High Strength Concrete Of The Bridge Piers

The article using ABAQUS finite element software to research seismic performance under high-strength stirrup of high-strength concrete piers under low cycle repeated load, the main contents include the following aspects:1.Comparing of steel and concrete nonlinear constitutive model, Selecting the proper constitutive model and simulation parameters for the finite element simulation analysis, Comparing the simulation results with test results, to verify the correctness and applicability of the finite element software ABAQUS.2.A total of 8 high-strength concrete pier confined by high-strength PC stirrups and HRB500 stirrups were simulated under cyclic lateral force and a constant axial loading through the finite element software ABAQUS. The characteristic of hysteresis loop, skeleton curve, ductility coefficient, hysteretic energy dissipation, ductility coefficient of energy are observed. The axial compression ratio, reinforcement ratio, stirrup types, stirrup spacing and concrete strength on the influence law of seismic performance of bridge pier are also analyzed. The results indicate that the hysteresis curve and hysteresis loop area of high-strength PC steel bar stirrup and HRB500 reinforced high strength concrete under repeated horizontal load are both big. They also have good ductility and energy dissipation capacity. Compared with HRB500 constraint high strength concrete, the PC steel bar confinement effect is more superior.3.The seismic performance of PC steel as stirrup restraint high-strength concrete pier was further researched. Under the different of concrete strength and axial compression ratio, the load-displacement hysteresis curve of the piers were analyzed.Putting forward the proposal of the skeleton curve model, and The changing rule of the hysteretic energy dissipation and a series of parameters such as the unloading stiffness, load stiffness and hysteresis loop back again was analyzed. on this basis, through the numerical fitting, the experience formula of strength degradation and stiffness of unloading stiffness and load again empirical formula was put forward.