Study On Seismic Performance Of PRC Bridge Pier

With the improvement of our transport system and the faster pace of economic construction, higher requirements are put forward to engineering structures. PRC pier came into being in this case. From a construction point of view, the PRC piers can speed up the construction speed, and reduce the construction period, and ensure the quality of construction. Force performance in terms of mechanical properties of the PRC pier, low ductility and low residual displacement are expressed. The seismic performance of PRC pier still is a problem worthy of study.In this paper, the FEM software Midas/Civil is used to analysis PRC pier’s seismic performance. Quasi-static method is selected to study the impact of the PRC pier parameters on its dynamic performance. Specific parameters include the rate of prestressed reinforcement, prestressing tendons prestressed tension degree of shear span ratio, axial load ratio, longitudinal reinforcement ratio, stirrup reinforcement ratio and concrete strength. By the moment-curvature hysteresis curve of PRC piers under different parameters to analyze the seismic performance, such as:cracking moment, yield moment, ultimate moment, initial stiffness and yield stiffness. The energy dissipation capacity, ductility and residual displacement of the PRC pier are also investigated.Through this study, it is found that prestressing tendons have an obvious pinch rope effect of moment-curvature hysteresis curve of PRC pier. Compared with ordinary RC piers, prestressing tendons can reduce the energy dissipation capacity and ductility of the structure, but receive a smaller residual displacement. This can ensure one of the design principles that bridge does not fall under big earthquake, and it is quite favorable to meet the security requirements of the structure.Finally, dynamic time history analysis is applied to a whole bridge with PRC pier. Study the dynamic response of the real bridge PRC piers in the ground motion, and further validate the conclusions drawn from the analysis.