Experimental Research On Seismic Performance And Opensees Numerical Simulation Analysis Of Rectangular Piers With High Strength Steel

As an important part of the traffic line,the bridge engineering has important function.Multiple damage earthquake has repeatedly shown the serious consequences of the situation that the bridge engineering has been destroyed.So the right seismic design on the bridge engineering is very important.The seismic performance of the pier will greatly affect the seismic performance of bridge structure.So the research point of this paper is to improve the seismic performance of bridge pier.In China,high strength steel is widely used in construction projects,but it is not common in bridge engineering.High strength steel with advantage of high strength and good ductility can save material dosage and achieve the effect of energy-saving and emission-reduction.In order to improve the seismic performance of the pier,the pier specimens with HRB500 steel are designed.The influence of high strength steel bars on seismic performance of specimens is analyzed by comparing with common specimens.In this paper,eight rectangular pier specimens were designed with main influencing parameters of longitudinal strength,stirrup strength,axial compression ratio and stirrup spacing.The failure characteristics,hysteretic and seismic behavior of the bridge pier specimens are analyzed by pseudo-static test.The results show that the damage form of all specimens was bending failure.The high strength steel has obvious improvement on piers' hysteretic behavior and seismic performance.The high strength of longitudinal reinforcement can improve the bearing capacity of specimens.But it has a negative effect on the ductility and energy dissipation capacity.Improving the strength of stirrup can slightly heighten the bearing capacity and ductility of specimens.The contribution of high-strength longitudinal reinforcement for pier specimens' stiffness degradation ability is bigger than the high-strength stirrup.Stirrup spacing has little effect on the hysteretic characteristics,but the small one can enhance the ductility performance of piers.Reducing the axial compression ratio can improve the deformation and hysteretic behavior of the specimens.It's also a effective measures to delay the stiffness degradation of piers.But it will reduce the bearing capacity of the bridge piers.The nonlinear numerical simulation of the bridge pier specimens is carried out by OpenSEES.The results about comparison of theory hysteretic curves and test hysteretic curves show that the fitting results are good.Considering the bond slip of steel and concrete can reflect the deformation and hysteretic capacity of the members better.