Experimental Research On Seismic Performance Analysis And Numerical Simulation Of HRB500 Reinforced Concrete Piers

As a kind of high strength hot rolled ribbed steel bars which comprehensive properties is excellent,HRB500 grade steel has the high tensile strength.If promote HRB500 reinforcement in the reinforced concrete structure,it will reduce the dosage of reinforcing steel bar and achieved good economic benefit and social benefit.Therefore,in order to improve the ability of bridge pier seismic energy,using high-strength longitudinal reinforcement and stirrup in the pier has very important theory and the practical significance.Base on the quasi-static test study and numerical simulation of seismic performance of HRB500 reinforced concrete piers,influence law about steel strength, the shear span ratio,the spacing, the axial compression ratio on seismic behavior was got according to the analy of its failure characteristics,the bearing capacity and displacement ductility,hysteresis curves, skeleton curves, stiffness degradation,the energy dissipation capacity under low cyclic loads.The results that increasing steel strength can improve components’ bearing capacity and the initial stiffness obviously,improve the hysteretic performance significantly,make the hysteretic curve more full,but reduce the energy dissipation ability of test pieces.In the case of low axial compression ratio, increasing stirrup characteristic values can make the hysteretic curve of specimen which is small shear span ratio more full,improve the specimen displacement ductility,but reduce the energy dissipation ability of test pieces and can’t influence members’ bearing capacity.For specimen which has large shear span ratio,improving the characteristic value of stirrup can’t improve the ultimate bearing capacity, displacement ductility effectively,but reduce the energy dissipation ability of test pieces.when the stirrup ratio is larger,the core concrete is constrained fully,axial compression ratio can improve the initial stiffness and ultimate bearing capacity significantly,but on the other hand, it will reduce displacement ductility significantly and not influence energy dissipation ability of test pieces significantly.Base on ANSYS finite element analysis software,the numerical simulation and nonlinear analysis were carried out.Through comparing the ANSYS finite element analysis results with the measured results,we found that there are high degree of agreement in both of them.The results of seismic performance test are further verificated, it also proves the correctness of the finite element model in this paper.And it provides a reliable model and basis for the future nonlinear analysis for pile by using the finite element software.