Seismic performance of prestressing precast bridge columns with socket connection

In order to fully utilize the advantages of large construction tolerance of socket connection and self-recovery of prestressed connection after earthquakes, a hybrid connection prefabricated assembled bridge pier (PCSC) with socket connection and prestressed reinforcement connection is proposed. Based on the actual engineering bridge pier, a finite element model of the pier was established using a fiber model, and the accuracy of the numerical model was verified by the in-situ full-scale test results. The performance indicators such as damage failure mode, hysteresis behavior, skeleton curve, energy dissipation capacity, equivalent stiffness, and residual displacement of the hybrid connected bridge pier was Analyzed. The results indicate that the failure mode of the PCSC bridge pier specimen is bending failure. The numerical analysis model established in this study can reproduce the experimental results well. The load displacement curve of PCSC bridge piers is roughly trilinear, and there is still a certain strengthening stage after yielding, with nonlinear inflection points and strength decline points. Compared with traditional cast-in-place (CIP) bridge pier, the configuration of unbonded post tensioned prestressed tendons in reinforced concrete hollow bridge piers greatly compensates for the weakened peak load and post yield stiffness of the piers due to the presence of connection, prolongs their yield point, improves ductility, yield strength, and horizontal resistance. The PCSC bridge piers exhibit weaker energy dissipation capacity. The prestressed tendons reduce the equivalent damping ratio of the bridge pier, increases the equivalent stiffness of the bridge pier, and has little effect on the residual displacement of the bridge pier.