Seismic Performance Test and Fem Analysis of Assembled Concrete Pier with Grouting Sleeve and Steel Tube Shear Connector

Compared with the traditional integral cast-in-place piers, the assembled piers have many advantages. In order to study the seismic performance of the new fabricated concrete piers with the nested connection of steel pipes, the overall design of the cast-in-place, traditional grouting sleeves and new steel pipes is designed. The seismic performance of three types of piers was studied. The horizontal low-cycle repeated load tests of three square pier specimens were carried out. The hysteresis curves, skeleton curves, ductility, energy consumption, strength degradation, stiffness degradation and deformation recovery of the members were tested. The performance and laws of the other aspects were studied and compared. The results show that the overall bearing capacity of the existing cast-in-place pier is closer than that of the new type of prefabricated pier. The hysteresis curve is full, the failure mode is the overall compression and failure, the displacement ductility and cumulative energy dissipation capacity are slightly better, and the residual displacement is small. The stiffness is less degraded, has good seismic performance and does not show significant strength degradation.